Bladeless Fan Using Coanda Nozzle for Quiet Airflow
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Solution Overview
Problem
Conventional fans produce uneven air flow and require close proximity to users, occupying workspace and blocking light, with noisy operation and complex designs.
Innovation Solution
A bladeless fan assembly utilizing a nozzle with a Coanda surface to direct air flow, amplifying it through entrainment, reducing noise and complexity, and allowing for efficient air distribution over a broader area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional fans with blades are used, then air circulation is achieved, but noise is generated and safety hazards arise
Solution Approach 1:
The patent removes the blades from the fan system entirely, extracting the harmful moving parts that generate noise and safety hazards while retaining the air circulation function through a different mechanism (air mover device with no rotating blades).
Solution Approach 2:
The patent replaces the traditional mechanical blade rotation system with an alternative air moving mechanism that does not use rotating blades, thereby eliminating the source of noise and safety concerns while maintaining airflow generation capability.
2Temperature
If fans are placed close to users, then cooling effect is improved, but workspace is occupied and light is blocked
Solution Approach 1:
The patent employs oscillation to distribute airflow across multiple spatial dimensions, allowing the fan to provide cooling over a broader area without requiring close proximity to the user. The oscillating motion enables the air mover to cover a wider spatial envelope, reducing the need for the fan to be positioned directly in the user's workspace.
3Reliability
If caged blade parts are used, then safety is improved, but cleaning becomes difficult
Solution Approach 1:
The patent eliminates the cage structure entirely by removing the blades, thereby solving the cleaning difficulty problem while maintaining safety through the absence of moving parts that could cause injury.
4Device complexity
If single set of blades is used, then structure is simple, but air flow is uneven and choppy
Solution Approach 1:
The patent employs oscillation to dynamically adjust the airflow direction and pattern, creating a more uniform and consistent air flow experience. The oscillating motion allows the air mover to compensate for potential unevenness in the airflow profile, distributing air more evenly across the user's field of view.
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 bladeless fan design provides a smooth, linear air flow that can be felt at a distance, increasing cooling efficiency and reducing noise, while allowing for a more compact and versatile fan that doesn't obstruct workspace or light.
Implementation Method 1
a Coanda surface located adjacent the mouth and over which the mouth is arranged to direct the air flow
Implementation Method 2
amplifying it through entrainment
Data Source
AI summary
A fan assembly for creating an air current includes a bladeless fan assembly including a nozzle and a device for creating an air flow through the nozzle. The nozzle includes an interior passage and a mouth receiving the air flow from the interior passage. A Coanda surface located adjacent the mouth and over which the mouth is arranged to direct the air flow. The fan provides an arrangement producing an air current and a flow of cooling air created without requiring a bladed fan, that is, the air flow is created by a bladeless fan.