Perforated Swirl Diffuser Outlet for High-Airflow Low-Noise Ventilation
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Solution Overview
Problem
Conventional twist outlets for ventilating rooms are limited in the amount of air they can introduce due to their radial arrangement of swirl vanes, resulting in restricted airflow and increased noise and pressure loss.
Innovation Solution
The outlet design features a perforated air guiding element with multiple smaller outlet openings, allowing for a broader velocity profile and increased airflow while maintaining lower pressure loss and noise levels, enabling a larger volume flow range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional radial swirl vanes are used, then airflow direction control is achieved, but the amount of air introduced is limited
Solution Approach 1:
The air guiding element is segmented into multiple smaller outlet openings (perforations) distributed across its surface, replacing the conventional single large outlet. This segmentation allows air to exit through numerous small openings simultaneously, dramatically increasing the total volume of air introduced into the room while maintaining the swirl effect through the radial arrangement of these segmented openings.
Solution Approach 2:
The invention transitions from a two-dimensional radial arrangement of swirl vanes to a three-dimensional structure where the air guiding element extends in the flow direction with multiple outlet openings distributed across its surface area. This dimensional expansion allows air to be introduced from multiple positions simultaneously, increasing the effective airflow cross-section and volume capacity.
2Productivity
If higher airflow volume is achieved, then ventilation efficiency improves, but pressure loss and noise increase
Solution Approach 1:
The air guiding element incorporates a porous structure with multiple small outlet openings distributed across its surface. This porous design allows air to pass through numerous small pathways simultaneously, reducing the velocity and turbulence at each individual opening. The collective effect of many low-velocity streams achieves high total airflow while minimizing pressure loss and noise generation compared to fewer high-velocity openings.
Solution Approach 2:
The invention changes the geometric parameters of the outlet structure from a single large opening to multiple small openings with specific size ratios. The small outlet openings have cross-sectional areas significantly smaller than the inlet area, creating a large number of flow paths. This parameter change transforms the velocity profile to be broader with lower peak velocities, reducing kinetic energy losses and noise while maintaining or increasing total airflow volume.
3Device complexity
If single large outlet opening is used, then simple structure is maintained, but velocity profile is narrow and pressure loss is high
Solution Approach 1:
The single large outlet opening is segmented into multiple smaller outlet openings arranged in a radial pattern on the air guiding element. This segmentation creates multiple parallel flow paths that distribute the airflow more evenly, preventing the formation of a narrow, high-velocity jet. The segmented structure reduces flow contraction and turbulence losses, thereby decreasing pressure loss while achieving the same or higher total airflow with a relatively simple radial configuration.
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 allows for a higher volume of air to be introduced into the room with reduced noise and pressure loss, providing a more efficient ventilation solution.
Implementation Method 1
a different velocity profile at the free edge of the air guide element facing the room to be ventilated as a result of a lower pressure difference between the inflow and outflow sides of the air guide element
Implementation Method 2
With swirl outlets, the air is introduced into the room to be ventilated with a swirl due to the radial arrangement of the swirl vanes. Room air is induced here.
Data Source
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AI summary
The invention relates to an outlet, in particular a twist outlet, for ventilating rooms, with a housing which has an air supply connection piece and a front outlet (1) which forms an outlet opening and is in particular quadrangular, with several outlet openings (2) being provided in the front outlet (1). and the front outlet (1) on the inflow side of each outlet opening (2) comprises an air guiding element (3) which is assigned to the respective outlet opening (2) and is designed in particular as a vane or swirl vane. In order to specify an outlet through which larger amounts of air can be introduced into the room, the front outlet (1) should, in addition to the outlet openings (2) in at least one partial area, also comprise a large number of further outlet openings (6) through a perforation provided there , wherein the free cross-sectional area of each such outlet opening (6) of the perforation is substantially smaller than the cross-sectional area of a through-opening (2).