Power Tool Dust Collector with Reverse Airflow Filter Cleaning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power tool dust collecting devices face inefficiencies in removing dust from filters, as dust can reattach to the filter surface despite airflow, reducing the effectiveness of dust removal.
Innovation Solution
A power tool dust collecting device with a housing containing a suction opening, a motor-driven fan chamber, a dust collecting chamber with a filter, and an accordion-shaped air pumping unit that reverses airflow to blow away dust from the filter, along with a shutter member to control air discharge and maintain pressure in the fan chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If airflow passes through the inflow opening to blow away dust from the filter surface, then dust removal is temporarily effective, but dust reattaches to the filter surface reducing removal efficiency
Solution Approach 1:
The patent introduces a reverse airflow mechanism that blows air from the downstream side to the upstream side of the filter, opposite to the normal suction direction. This reverse flow actively dislodges and removes dust that has accumulated on the filter surface, preventing reattachment and maintaining continuous dust removal effectiveness without requiring manual intervention.
2Productivity
If a simple suction mechanism is used, then device complexity is low, but dust removal efficiency deteriorates due to dust reattachment
Solution Approach 1:
The patent employs periodic reverse airflow pulses to clean the filter surface. The air pumping unit operates intermittently to generate reverse flows at specific intervals, which is sufficient to prevent dust reattachment without requiring continuous complex mechanisms. This periodic action maintains dust removal efficiency while keeping the device structure relatively simple.
Solution Approach 2:
The system uses its own suction airflow to generate the reverse flow needed for filter cleaning. The air pumping unit utilizes the existing airflow from the suction mechanism to create the counter-flow that blows dust off the filter, allowing the system to self-clean without requiring external power sources or additional complex cleaning mechanisms.
3Productivity
If reverse airflow is introduced to blow away dust from the filter, then dust separation efficiency improves, but device complexity increases due to additional air pumping unit
Solution Approach 1:
The patent combines the air pumping unit with the existing suction mechanism housing and integrates it into the overall dust collection system. The reverse flow path is merged with the existing airflow channels, and the control mechanism is integrated with the motor control system. This merging approach introduces the necessary reverse airflow functionality while minimizing additional structural complexity.
Solution Approach 2:
The air pumping unit serves multiple functions: it generates reverse airflow for filter cleaning, maintains pressure differential across the filter, and can be controlled to operate at different stages of the suction process. This multi-functionality justifies the added component by providing several benefits from a single integrated unit, reducing the need for separate dedicated mechanisms.
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 solution effectively improves dust separation efficiency by reversing airflow to dislodge dust from the filter, preventing reattachment and enhancing the overall cleaning process.
Implementation Method 1
a fan chamber which is formed in the housing and which houses a fan that rotates in accordance with driving of the motor
Implementation Method 2
a dust collecting chamber provided in the housing on an upstream side of the fan chamber in which a filter through which air sucked up from the suction opening due to rotation of the fan passes is mounted and the filter collecting dust in the air
Implementation Method 3
an air pumping unit provided inside the housing pumping air from a downstream side toward an upstream side of the filter
Data Source
AI summary
A power tool dust collecting device includes a fan chamber and a dust collecting chamber. The fan chamber is formed in a housing which is mountable on a hammer drill and in which a suction opening is provided protrudingly. The fan chamber houses a fan that rotates in accordance with driving of a motor. The dust collecting chamber is formed on an upstream side of the fan chamber. Mounted on the dust collecting chamber is a filter through which passes air that has been sucked up from the suction opening by the rotation of the fan and which collects dust included in the air. An air pumping unit that pumps air from a downstream side of the filter toward an upstream side is provided inside the housing.