Dirt separator

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Solution Overview

Problem

Vacuum cleaners experience performance reduction and increased power consumption due to pressure losses in airflow through separation stages, leading to inefficient dirt collection and potential clogging.

Innovation Solution

A dirt separator design with a dirt collection chamber and outlet chamber having constant cross-sectional areas, unbalanced suction for efficient dirt collection, and a valve mechanism for easy emptying, along with a filter assembly that encourages airflow scrubbing to maintain performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the cross-sectional area of the outlet chamber is gradually decreased from outlet to opening to balance suction along the filter assembly, then dirt collects more evenly on the filter assembly, but the dirt collection chamber fills with dirt inefficiently and clogs at the opening end

Engineering Contradiction:

Improveeven dirt distribution on filter assemblyVSAvoiddirt collection capacity

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent inverts the conventional approach by maintaining a constant cross-sectional area of the outlet chamber instead of decreasing it. This inversion creates unbalanced suction that intentionally allows dirt to accumulate preferentially at the outlet end of the filter assembly, preventing clogging at the opening end and improving overall dirt collection capacity.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the suction along the filter assembly is balanced to ensure even dirt loading, then the filter assembly is loaded evenly with dirt, but the vacuum cleaner requires more frequent emptying due to inefficient dirt chamber filling

Engineering Contradiction:

Improvefilter assembly loading uniformityVSAvoidtime between emptying operations

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies local quality by creating non-uniform suction distribution along the filter assembly length. The constant cross-sectional area design causes suction to be strongest at the outlet end and weakest at the opening end, directing dirt accumulation to specific locations (outlet end) rather than distributing it uniformly, thereby optimizing dirt chamber utilization.

Inventive Principle:

Principle #3Local quality

3Quantity of substance

If the cross-sectional area of the outlet chamber is constant along the filter assembly length, then dirt collection capacity is maximized and clogging is prevented, but suction is unbalanced along the filter assembly

Engineering Contradiction:

Improvedirt storage capacityVSAvoidsuction distribution uniformity

Core Design Contradiction:

Quantity of substanceVSStress or pressure

Solution Approach 1:

The patent accepts and utilizes the unbalanced suction distribution as a beneficial effect rather than a problem to be solved. The constant cross-sectional area design intentionally creates stronger suction at the outlet end, which actively directs dirt toward the outlet end of the filter assembly and prevents clogging at the opening end, maximizing dirt storage capacity.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Enhances dirt collection capacity, improves filtration efficiency, and extends the time between cleaning or replacement, while maintaining compact size and ergonomic design.

Implementation Method 1

suction is generated at the outlet of the dirt separation chamber, causing airflow to flow along an airflow pathway from the opening to the outlet

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Implementation Method 2

the suction is unbalanced along the length of the filter assembly. In particular, suction is greatest at the end of the filter assembly adjacent the outlet and is weakest at the end of the filter assembly adjacent the opening

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 3

a filter assembly extending parallel to the longitudinal axis and dividing the dirt separation chamber into a dirt collection chamber upstream of the filter assembly, and an outlet chamber downstream of the filter assembly

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Data Source

PatentUS20250375077A1Dirt separator

Publication Date: 2025.12.11 DYSON TECH LTD

AI summary

A dirt separator for a vacuum cleaner is provided, which includes a dirt separation chamber, a filter assembly, and an outlet chamber. The dirt separation chamber extends along a longitudinal axis from an opening to an outlet. The filter assembly extends parallel to the longitudinal axis and divides the dirt separation chamber into a dirt collection chamber upstream of the filter assembly. The outlet chamber is downstream of the filter assembly. The outlet chamber has a cross-sectional area that is substantially constant along a length of the filter assembly.