Flat Flow-Conducting Grille for Compact Fan Intake
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Solution Overview
Problem
Existing flow guide grids for fan intake areas require significant axial installation space due to their curved design, which is not suitable for tight conditions, and there is a need to maintain performance while minimizing noise generation.
Innovation Solution
A flat flow guide grille with radial and coaxial webs, a central opening, and specific geometric ratios to reduce axial height and installation space, ensuring efficient airflow and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curved flow guide grid design is used, then the airflow performance is improved, but the axial installation space requirement increases
Solution Approach 1:
The patent inverts the conventional curved design approach by using a flat flow guide grid with radially inclined webs. Instead of curving the grid in the axial direction, the invention inclines the webs radially, achieving flow guidance in a plane perpendicular to the conventional curvature direction. This inversion resolves the contradiction by maintaining flow performance while eliminating the axial space requirement.
Solution Approach 2:
The patent transitions from a three-dimensional curved structure (requiring axial space) to a two-dimensional flat structure with radial inclination. By changing the dimension of the guiding action from axial curvature to radial planar inclination, the invention achieves flow guidance without consuming axial installation space, thus resolving the technical contradiction.
2Length of moving object
If a flat flow guide grid is used, then the axial installation space is reduced, but the turbulence minimization capability may be compromised
Solution Approach 1:
The patent applies different inclination angles to different regions of the flow guide grid. The radially inclined webs are configured with specific angles relative to the radial plane, creating localized flow guidance zones that minimize turbulence in different areas of the intake. This local optimization ensures that turbulence minimization is maintained despite the flat overall structure.
Solution Approach 2:
The patent optimizes specific geometric parameters of the flat grid, including the inclination angle of the webs relative to the radial plane and the ratios of diameters (D1/D3, D4/D3). By carefully selecting these parameters within specified ranges, the invention achieves turbulence minimization performance comparable to curved designs while maintaining the flat configuration for reduced axial space.
3Adaptability or versatility
If the central opening diameter is increased, then the fan component arrangement flexibility is improved, but the airflow area is reduced
Solution Approach 1:
The patent specifies an optimized range for the ratio of central opening diameter to outer diameter (D1/D3 between 1.5-6.0, preferably 2.0-2.5). This parameter optimization balances the competing requirements: providing sufficient central opening for fan component arrangement while maintaining adequate airflow area through the annular region, thus resolving the contradiction between adaptability and airflow area.
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 allows for a compact fan design with minimal axial height, maintaining performance and reducing noise generation compared to curved designs, while optimizing airflow in tight spaces.
Implementation Method 1
The level, flat extension allows utilization of the minimization of turbulence in the intake area on the inflow side of the flow guide grid
Data Source
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AI summary
The invention relates to a flow-conducting grille designed as a pre-conducting grille for arranging on an suction region of a fan, wherein the flow-conducting grille has a grille web structure about an axial center line, which grille web structure comprises radial webs spaced apart in the circumferential direction and coaxial circumferential webs spaced apart in the radial direction and an outer ring, wherein an inflow side of the flow-conducting grille extends flatly and parallel to a radial plane of the flow-conducting grille.