Hammer Drill Dust Collector Filter Cleaning Without Dust Blowout
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Solution Overview
Problem
Conventional dust collectors for electric power tools face issues with filter clogging, leading to decreased dust collection efficiency and reduced product lifetime, as dust can accumulate in the dust collecting route or be blown out, necessitating costly modifications to prevent dust from reaching the suction opening.
Innovation Solution
A dust collector design featuring a casing with a tubular suction opening, a dust collecting route, a filter, and a dust removal means, where the dust removal means, such as an elastic member or cam, directly acts on the filter from outside the dust box to remove accumulated dust through expansion, contraction, vibration, or rotation, preventing clogging without projecting outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is flown backward on the dust collecting route to blow away dust from the filter, then filter clogging is avoided, but dust may accumulate in the middle of the dust collecting route or be blown out from the suction opening portion
Solution Approach 1:
The dust removal means is extracted from the dust collecting route and positioned to directly act on the filter from outside the dust box. This separates the dust removal function from the air flow path, eliminating the risk of dust accumulation in the middle of the dust collecting route while maintaining effective filter cleaning
Solution Approach 2:
A dust removal means (such as a pump or blowing device) is introduced as an intermediary element to remove dust from the filter. This mediator is positioned outside the dust box and acts directly on the filter, enabling dust removal without interfering with the dust collecting route
2Object-generated harmful factors
If the dust collecting route is processed to avoid dust movement to the suction opening portion, then dust is not blown out, but manufacturing cost increases
Solution Approach 1:
The dust removal function is extracted from the dust collecting route and implemented as a separate component positioned outside the dust box. This eliminates the need for complex routing modifications to prevent dust blowout, as the dust removal means directly acts on the filter without interfering with the air flow path
Solution Approach 2:
Instead of modifying the dust collecting route to prevent dust movement, the approach is inverted by directly removing dust from the filter at its location. This reverses the conventional approach of preventing dust movement and instead focuses on active dust removal from the source
3Ease of manufacture
If dust removal means directly acts on the filter from outside the dust box, then dust removal is simplified and cost-effective, but the dust removal means must be positioned close to or abutted on the filter
Solution Approach 1:
The dust box is designed with a movable lid that can be opened to provide access to the filter. This dynamic structure allows the dust removal means to be positioned close to or abutted on the filter when needed, while maintaining a compact closed structure during normal operation. The movable lid enables flexible positioning of the dust removal means without permanently increasing device complexity
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 design effectively prevents filter clogging by allowing easy and cost-effective dust removal from the filter, ensuring efficient operation and extending the filter's lifespan by applying vibrations or expansions directly to the filter without hindering the tool's operation.
Implementation Method 1
an elastic member that forms a part of the dust box and has an inner surface abutted on the filter by at least an elastic deformation
Implementation Method 2
a cam rotated by rotation of an output shaft of the dust collection motor
Data Source
AI summary
In a dust collector for electric power tool, while a casing includes a tubular suction opening portion disposed to protrude forward, a dust collecting route is formed in the casing to ensure capturing a dust suctioned with an air by a filter disposed in a dust box. The suction opening portion is abutted on a surface to be processed and a tool bit of a hammer drill is passable through the suction opening portion. The dust collecting route suctions the air from the suction opening portion and guides the air into the dust box disposed to the casing. The dust box includes a dust removal device (rubber) configured to directly act to the filter from outside to remove the dust accumulated on the filter.