Curved Air Guiding Members for Bidirectional Flow Stability
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Solution Overview
Problem
Current air volume flow controllers in air distribution networks are sensitive to flow disruptions, produce turbulences, and often function only in one direction, leading to inconsistent control behavior and noise issues.
Innovation Solution
A device with radially extending air guiding members that can be adjusted by rotating first and second air guiding units about the longitudinal center axis, forming a structure similar to a rotor, allowing for consistent control of air volume flow and bidirectional functionality without changing the location of the narrowest flow cross section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional air volume flow controllers (flaps, blades, or iris diaphragms) are used to adjust air flow, then the air volume flow can be controlled, but significant turbulences are produced in the flow and disruptive whistling noises occur
Solution Approach 1:
The air guiding members are designed with curved surfaces instead of flat flaps or blades. The first and second air guiding units have curved outer surfaces that guide air flow smoothly through the device, reducing turbulence and noise generation while maintaining effective air volume flow control.
Solution Approach 2:
The invention changes the geometric parameters of the air guiding members, specifically using curved surfaces with optimized radii and angles. The curved surfaces have specific radius values (e.g., R1, R2, R3) and angle relationships (e.g., alpha, beta, gamma) that are designed to minimize flow separation and turbulence, thereby reducing noise while controlling air flow.
2Productivity
If traditional air volume flow controllers are used, then air flow can be adjusted, but the controllers are very sensitive to disrupted incident flow and generally only function in one flow direction
Solution Approach 1:
The air guiding members feature asymmetric curved surfaces with different radii and angles on opposite sides. This asymmetric geometry is specifically designed to accommodate and guide disrupted incident flow from various directions, making the device less sensitive to flow disruptions and enabling functionality in multiple flow directions.
Solution Approach 2:
The device is designed to function effectively in multiple flow directions by incorporating curved air guiding members that can adapt to different incident flow angles. The universal design allows the same device to control air flow whether the incident flow comes from the left, right, top, or bottom, eliminating the limitation of single-direction operation.
3Productivity
If the position of the flap or blades is changed to control air volume flow, then air volume flow is adjusted, but significant turbulences are also produced in the flow
Solution Approach 1:
The curved surfaces of the air guiding members create smooth flow paths that maintain flow stability. As the first and second air guiding units rotate relative to each other, the curved surfaces continuously guide the air flow without creating sharp edges or sudden obstructions, thereby adjusting air volume flow while minimizing turbulence and maintaining flow stability.
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 device provides consistent control of air volume flow, reduces turbulence and noise, and maintains functionality in both flow directions, with the ability to adjust flow based on admission pressure and position, ensuring optimal flow behavior and adjustability.
Implementation Method 1
the first air guiding unit can be rotated relative to the second air guiding unit about the longitudinal center axis of the device. By rotating the first air guiding unit relative to the second air guiding unit, the opening cross section of the air passages can be changed.
Data Source
AI summary
A device for adjusting a constant air volume flow has air guiding members which extend in a radial direction and in a state distributed about a longitudinal center axis of the device. Between adjacent air guiding members there are formed air passages which can be adjusted in terms of their opening cross section. The air guiding members are formed from a first and a second air guiding unit in each case. By rotating the first air guiding unit relative to the second air guiding unit, the opening cross section of the air passages can be changed. The air guiding units are constructed in such a manner that the air guiding member formed thereby has a closed and curved surface at least at the inflow side. This enables a change of the free flow cross section, wherein the location of the narrowest flow cross section is consistent at different adjustment positions.