Power Tool Suction Module Fan Layout for Higher Dust Extraction
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Solution Overview
Problem
Existing suction modules for hand-held power tools have limited suction power due to restricted radial extension of the fan, which is constrained by the narrowest dimension of the suction housing, leading to inefficient air guidance and reduced suction efficiency.
Innovation Solution
The fan axis is aligned parallel to the narrow axis of the suction module, allowing for a larger radial extension of the fan wheel, which increases suction power by utilizing the larger dimensions of the suction housing, and an optimized air path with a filter and diffusor design minimizes flow losses and housing volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the fan axis is arranged parallel to the tool axis (conventional design), then the housing dimensions can be compact, but the radial extension of the fan is restricted and suction power is reduced
Solution Approach 1:
The patent reorients the fan axis from a parallel arrangement to the tool axis to a perpendicular arrangement. This dimensional change allows the fan wheel to extend radially in directions not constrained by the narrow housing dimensions, enabling larger fan wheels to be accommodated within the same housing volume while achieving greater suction power
2Power
If the fan axis is arranged perpendicular to the narrow axis, then larger fan wheels can be installed for greater suction power, but the air path becomes more complex
Solution Approach 1:
The patent employs curved air channels and smooth transitions in the air path design to accommodate the perpendicular fan axis arrangement. The curved pathways guide air efficiently from the tool end through the housing to the discharge opening, minimizing flow resistance and turbulence despite the changed fan orientation
3Productivity
If the radial extension of the fan is increased for greater suction power, then volume flow and negative pressure improve, but the housing size must increase
Solution Approach 1:
By changing the fan axis orientation to perpendicular, the patent enables the fan wheel to utilize the housing's transverse dimensions for radial extension rather than being constrained by the narrow axial dimension. This allows larger fan wheels with greater volume flow capacity to be installed without increasing the overall housing volume
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 configuration achieves enhanced suction power with a compact design, allowing for higher volume flows and negative pressure, effectively preventing contamination and explosion hazards by efficiently removing dust and debris from the work area.
Implementation Method 1
The blower wheel or fan wheel is driven by an integrated motor or by the motor situated in the hammer drill and combination hammer via a shaft-hub connection
Implementation Method 2
a filter and an air-conducting fluid path (sections of which are also particle-charged) in common in a housing unit
Data Source
AI summary
A suction module which can be connected to a hand-held power tool, and a hand-held power tool including the suction module, is disclosed. The suction module includes a suction head which can receive a tool of the hand-held power tool that is rotatable around a tool axis and a fan with a fan wheel that is rotatable around a fan axis for suctioning air from the suction head. The suction head is connected to the fan by an intake channel, which in a first section runs along a longitudinal axis of the suction module and in a second section along a vertical axis of the suction module that is fixed transverse to the longitudinal axis. The fan axis runs parallel to a narrow axis, which is aligned transverse to the longitudinal axis and transverse to the vertical axis.