Mesh Prefilter Assembly for Vacuum Filter Blockage Reduction

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Solution Overview

Problem

Vacuum devices face blockages due to debris larger than dust particles, which decrease airflow and require frequent filter cleaning, especially when handling materials like blown-in insulation or wood debris.

Innovation Solution

A prefilter assembly for vacuum devices, comprising a frame with a mesh layer and engagement features, is designed to surround the filter, preventing larger debris from reaching the filter and allowing airflow while capturing smaller particles, thus reducing blockages and the need for frequent filter cleaning.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a filter is used to capture debris, then the motor is protected and extended life is achieved, but larger debris causes blockages and requires frequent cleaning

Engineering Contradiction:

Improvemotor protectionVSAvoidfilter cleaning frequency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The filtration system is divided into two distinct components: a prefilter with larger mesh openings for capturing larger debris, and a main filter with finer pores for capturing smaller particles. This segmentation allows each filter to handle specific size ranges of debris, preventing the main filter from becoming blocked by larger particles that would require frequent cleaning.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The prefilter performs preliminary filtration by capturing larger debris particles before they reach the main filter. This preliminary action removes the bulk of problematic debris that would cause blockages, allowing the main filter to focus on capturing finer particles without becoming overwhelmed by larger debris.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the filter captures all debris, then motor protection is maximized, but airflow is restricted and cleaning frequency increases

Engineering Contradiction:

Improvemotor protectionVSAvoidairflow

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the filtration system have different mesh sizes optimized for their specific functions. The prefilter has larger openings suitable for capturing larger debris while maintaining high airflow, while the main filter has finer pores for capturing smaller particles. This local quality optimization ensures that no single filter is overburdened.

Inventive Principle:

Principle #3Local quality

3Loss of time

If a prefilter is added to capture larger debris, then filter cleaning frequency is reduced, but device complexity increases

Engineering Contradiction:

Improvefilter cleaning frequencyVSAvoidfilter assembly structure

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The prefilter and main filter are merged into a single integrated filter assembly where the prefilter is positioned around the main filter. They are combined such that both filters work together as a unified system, with the prefilter capturing larger debris and the main filter capturing smaller particles, reducing the need for frequent cleaning without requiring separate maintenance procedures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The prefilter is positioned around the main filter in a nested configuration, with the prefilter forming an outer cylindrical structure that surrounds the inner main filter. This nesting arrangement allows both filters to be integrated into a compact assembly that fits within the vacuum device housing, minimizing the increase in device complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

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

The prefilter assembly significantly reduces the frequency of filter cleaning by blocking larger debris and allowing smaller particles to pass through, extending the operational time of the vacuum device and improving efficiency.

Implementation Method 1

a mesh layer comprising a plurality of mesh openings, the mesh layer coupled to the frame and configured to cover the openings to prevent debris larger than a size of the mesh openings from passing therethrough

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentUS20240032750A1Mesh prefilter for vacuum device

Publication Date: 2024.02.01 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A prefilter for a filter of a vacuum device 1 includes a frame extending in an axial direction between first and second axial extents. The frame includes a base located at the first axial extent, a first cylindrical ring extending axially from the base toward the second axial extent, a plurality of ribs extending from the first cylindrical ring towards the second axial extent and defining openings between the ribs, and a second cylindrical ring portion positioned at the second axial extent of the frame. The prefilter also includes a mesh layer comprising a plurality of mesh openings, the mesh layer coupled to the frame and configured to cover the openings to prevent debris larger than a size of the mesh openings from passing therethrough. The prefilter also includes an engagement feature coupled to the frame and configured to engage the filter to fasten the frame to the filter.