Blowing Structure for Bladeless Fan with Dolphin Contour
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Solution Overview
Problem
Conventional bladeless fans with tubular air delivery ducts suffer from turbulent kinetic energy on the inner wall, leading to airflow inefficiencies, noise, and limited air supply distance.
Innovation Solution
A blowing structure featuring two symmetrically arranged air delivery ducts with a dolphin-like outer contour, each equipped with an internal air chamber, bottom air inlet, and side-wall air slot, which reduces aerodynamic noise and turbulence by minimizing pressure and turbulent pulsations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional tubular air delivery duct is used, then the aesthetic appearance is maintained, but turbulent kinetic energy increases on the inner wall causing noise and airflow energy loss
Solution Approach 1:
The air delivery duct is designed with a dolphin-like outer contour featuring curved surfaces instead of straight cylindrical shapes. This curvature reduces turbulent kinetic energy on the inner wall by smoothing airflow transitions, thereby reducing aerodynamic noise and minimizing airflow energy loss while maintaining aesthetic appearance.
Solution Approach 2:
The cross-sectional area of the air delivery duct is optimized along its length with specific dimensional parameters (length L and width H satisfying 0.2 ≤ H/L ≤ 0.5) to control airflow characteristics. This parameter optimization reduces turbulent pulsation and pressure pulsation, thereby reducing noise and energy loss.
2Length of stationary object
If a conventional tubular air delivery duct is used, then the structure is simple, but air supply distance is limited due to high noise and energy loss
Solution Approach 1:
The dolphin-like curved contour of the air delivery duct reduces turbulent kinetic energy and associated noise, thereby extending the effective air supply distance by maintaining higher airflow efficiency over longer distances without the noise and energy loss limitations of conventional straight tubular ducts.
Solution Approach 2:
By optimizing the dimensional parameters of the air delivery duct (particularly the length-to-width ratio of 0.2 ≤ H/L ≤ 0.5), the design achieves reduced turbulent pulsation and extended air supply distance while minimizing noise generation.
3Productivity
If the air delivery duct is designed only according to aesthetic appearance, then manufacturing is easy, but user experience and technical performance are insufficient
Solution Approach 1:
The dolphin-like curved design achieves both aesthetic appeal and improved airflow efficiency by reducing turbulent kinetic energy. The curved geometry, while slightly more complex than straight ducts, follows natural flow patterns that enhance performance without requiring complex manufacturing processes.
Solution Approach 2:
The design incorporates specific optimized parameters (cross-sectional area distribution, length-to-width ratio) that improve airflow efficiency and technical performance while remaining manufacturable through standard molding or fabrication processes.
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 proposed blowing structure enhances airflow efficiency, extends air supply distance, and significantly reduces noise, thereby improving the overall performance of bladeless fans.
Implementation Method 1
due to an increase in turbulent kinetic energy on the inner wall of the air supply duct of a conventional tubular air delivery duct, airflow is negatively impacted and undesirable high noise is caused
Implementation Method 2
weakening the pressure pulsation and turbulent pulsation on the surface of the air delivery ducts and at the air outlets
Data Source
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AI summary
A blowing structure for a bladeless fan comprises two air delivery ducts (1) and a connector (2), wherein the two air delivery ducts (1) are symmetrically arranged at two bottom ends of the connector (2), and wherein the air delivery ducts (1) have dolphin-like outer contour. Each air delivery duct (1) is provided with an internal air chamber (101), a bottom air inlet and a side-wall air slot (103), wherein the air inlet (102), the air chamber (101) and the air slot (103) are connected to each other.