Coanda Blower Nozzle Structure for Low-Resistance Airflow
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Solution Overview
Problem
Existing blowers using the coanda effect face challenges in optimizing airflow paths for minimal resistance and direction, manufacturing complexity, and maintenance due to non-separable components and narrow passages that accumulate dust.
Innovation Solution
A blower design featuring a fan with a lower body and upper bodies forming flow paths and slits, allowing for adjustable and detachable panels to minimize resistance and facilitate cleaning, with features like vanes, heaters, and protrusions to guide airflow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the outer wall and inner wall are provided as one piece to form the mouse and coanda surface, then the structure is simple, but it is difficult to optimize airflow path and surface design for minimal resistance and required airflow direction
Solution Approach 1:
The nozzle is divided into an outer wall and an inner wall that can be separately manufactured and then assembled. This segmentation allows each component to be optimized independently for airflow characteristics while maintaining structural simplicity through modular construction.
2Ease of manufacture
If the outer wall and inner wall are provided as one piece, then manufacturing is simplified, but it is difficult to clean or repair parts where foreign matter accumulates
Solution Approach 1:
The nozzle is segmented into separable outer wall and inner wall components. The inner wall can be detached from the outer wall, enabling access to narrow passages for cleaning accumulated dust and foreign matter, while still allowing for simple manufacturing through separate component production.
3Reliability
If the inner passage is formed by outer wall and inner wall approaching to form mouse, then coanda effect is induced, but the narrow passage accumulates dust and cannot be separated for maintenance
Solution Approach 1:
The mouse-forming narrow passage is created by bringing the outer wall and inner wall close together, but these walls are designed as separable components. This allows the passage to maintain its airflow-generating geometry while enabling periodic disassembly for cleaning and maintenance of dust accumulation areas.
4Manufacturing precision
If complex curves are formed in the upper body for optimal airflow, then airflow distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The upper body with complex curves is divided into separate components (outer wall, inner wall, panel) that can be manufactured using different methods. This segmentation allows complex curved surfaces to be created through assembly of simpler components rather than requiring complex monolithic manufacturing.
Solution Approach 2:
The design incorporates curved surfaces and smooth transitions in the upper body components to optimize airflow distribution. These curves are implemented in the geometry of the separable components, allowing aerodynamic optimization without increasing fundamental manufacturing complexity.
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 design achieves efficient airflow distribution, minimizes resistance, and allows for easy assembly and maintenance, providing a wide-range airflow and optimal discharge while ensuring complex curves can be manufactured and maintained.
Implementation Method 1
a fan causing airflow
Implementation Method 2
a blower capable of forming an airflow using a coanda effect
Data Source
Figure 1
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AI summary
A blower is provided. The blower according to the present disclosure includes: a fan causing airflow; a lower body forming an inner space at which the fan is disposed, and having a suction hole through which air passes; and a first upper body positioned above the lower body, and the first upper body may include a first wall forming a first flow path communicating with the inner space of the lower body and a first panel surrounding the first wall, and the first panel may include a first slit formed through the first panel and discharging air flowing through the first flow path to an outside of the first panel.