Dust Collector Intake Valve Layout for In-Operation Filter Cleaning

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Solution Overview

Problem

Existing dust collectors require complex electrical control systems to clean filters during operation, complicating the structure and increasing costs.

Innovation Solution

A dust collector design featuring a pair of intake paths with first and second opening and closing members, operated by a motor and cam mechanism, allows for filter cleaning without electrical control, using a tilted portion with a vent hole to manage airflow and simplify the structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If electromagnetic valves are used to open and close air inlet pipes for filter cleaning, then filter cleaning during operation is enabled, but the structure becomes complex due to required electrical control devices

Engineering Contradiction:

Improvefilter cleaning capabilityVSAvoidelectrical control structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent replaces electromagnetic valves (electrical control system) with a mechanical cam mechanism driven by a motor to open and close opening/closing members. This mechanical substitution eliminates the need for complex electrical control devices while maintaining the filter cleaning function during operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cam mechanism is designed to automatically control the opening and closing members in a predetermined sequence, enabling the system to self-regulate the air flow paths for filter cleaning without requiring external electrical control signals. The mechanical system serves itself through the inherent motion characteristics of the cam profile

Inventive Principle:

Principle #25Self-service

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

Enables filter cleaning during operation without electrical control, reducing manufacturing costs and maintaining effective dust separation by minimizing static electricity accumulation on filters.

Implementation Method 1

air and dust are drawn through the gas inlet into the dust container having a negative pressure due to evacuation from the gas outlet

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Implementation Method 2

the dust is captured by the filter group

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 3

the discharged air is caused to flow backward in the intake path and returned to the tank through the filter, and is guided to the other intake path, so that the dust on the filter of the one intake path is removed

Methodology Applied

Scientific EffectAir flow: Convection

Data Source

PatentUS8940064B2Dust collector

Publication Date: 2015.01.27 MAKITA CORP

AI summary

A dust collector having a filter for catching dust in air flowing in an intake path is provided. A pair of the intake paths are formed so as to be combined together on an upstream side of an electric blower provided in a main body. A pair of communication paths allow a discharge passage to communicate with each of the intake paths. A first opening and closing member is provided so as to open and close the intake path, and in a normal state, is biased to open the intake path. A second opening and closing member is provided so as to open and close the communication path, and in the normal state, is biased to close the communication path, and opens the communication path in response to a closing operation of the intake path by the first opening and closing member.