Aerodynamic Protection Grille for Portable Blower Flow
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Solution Overview
Problem
Existing portable blowers face inefficiencies in aerodynamics and turbulence due to the profiles of their protection grilles, which hinder the quality and homogeneity of the air flow output, leading to excessive resistance and unwanted recirculation.
Innovation Solution
The portable blower incorporates a protection grille with an aerodynamic profile, featuring elements with a convex shape and NACA design, reducing resistance and turbulence by optimizing the air flow path between the flow generator device and the blowing opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If classic protection grilles with round or rectangular profiles are used, then safety protection is achieved, but excessive resistance and turbulence are generated
Solution Approach 1:
The patent changes the geometric parameters of the protection grille elements from classic round or rectangular profiles to aerodynamic profiles with specific curvature characteristics. The aerodynamic profile includes a rounded leading edge and a tapered trailing edge, optimizing the flow separation and reducing turbulence while maintaining safety protection functionality.
Solution Approach 2:
The patent applies curved surfaces by designing the protection grille elements with aerodynamic profiles that feature rounded leading edges and smooth transitions. This curvature optimization reduces flow separation and turbulence compared to sharp-edged classic profiles, thereby reducing energy loss while maintaining structural integrity for safety protection.
2Reliability
If classic protection grilles are used, then safety protection is achieved, but unwanted turbulence and recirculation occur
Solution Approach 1:
The patent modifies the geometric parameters of the protection grille elements by implementing aerodynamic profiles with specific curvature characteristics. The rounded leading edge and tapered trailing edge design changes the flow pattern, reducing turbulence and recirculation zones that are commonly generated by classic sharp-edged profiles.
Solution Approach 2:
The patent employs curved surfaces in the aerodynamic profile design of protection grille elements. The smooth curvature transitions eliminate sharp edges that cause flow separation and turbulence, thereby reducing harmful recirculation while preserving the protective function of the grille structure.
3Loss of energy
If aerodynamic profile elements are used, then air flow resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent defines specific aerodynamic profile parameters including leading edge radius, trailing edge taper, and overall element geometry. These parameter specifications enable standardized manufacturing processes while achieving the desired aerodynamic performance, balancing flow resistance reduction with manufacturing feasibility.
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 enhances the efficiency and quality of the air flow output, achieving a more homogeneous and laminar flow with reduced resistance and turbulence, improving the overall performance of the blower.
Implementation Method 1
one or more elements (8a, 8b) of the reticular structure (8) have an aerodynamic profile (9) defined between an attachment edge (9a) facing the flow generator device (6) and an outlet edge (9c), the aerodynamic profile (9) having maximum thickness in an intermediate zone (9b) interposed between the attachment edge (9a) and the outlet edge (9c), the one or more elements (8a, 8b) of the reticular structure (8) having at least one among an upper, or extrados, surface and a lower, or intrados, surface, of convex shape
Data Source
Figure 1
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Figure 4
AI summary
A portable blower (1) comprises: a structure (2), at least partially hollow, defining at least one conduit (3) for the transit of an air flow between a suction zone (4) and a blowing end (5), at which a blowing opening (10) of the portable blower (1) is defined; a flow generator device (6) operatively arranged inside the structure (2) and/or the conduit (3) which is switchable between a non-operating condition, in which no air flow is generated along the conduit (3), of the structure (2) and an operating condition, in which an air flow is generated along the conduit (3) of the structure (2) between the suction zone (4) and the blowing end (5) and/or the blowing opening (10); a protection grille (7) arranged along the conduit (3) of the structure (2) of the portable blower (1) between the flow generator device (6) and the blowing opening (10), in which the protection grille (7) has a substantially reticular structure (8) in which one or more elements (8a, 8b) of the reticular structure (8) have an aerodynamic profile (9), optionally a wing profile, defined between a rounded attachment edge (9a) facing the flow generator device (6) and an outlet edge (9c), and in which the aerodynamic profile (9) has a maximum thickness in an intermediate zone (9b) interposed between the attachment edge (9a) and the outlet edge (9c), in which one or more elements (8a, 8b) of the reticular structure (8) have at least one among an upper, or extrados, surface and a lower, or intrados, surface of convex shape.