Bladeless Fan Assembly With Coanda Nozzle for Uniform Heated Airflow
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Solution Overview
Problem
Conventional fan heaters produce non-uniform and turbulent air flows due to variations in blade surface and heating coil designs, leading to inefficient heat distribution and accumulation of dust, which can result in unpleasant odors and safety concerns.
Innovation Solution
A bladeless fan assembly that uses a nozzle with a Coanda surface and diffuser to create a uniform air flow, combined with a heater located within the nozzle or in the air path to heat the air efficiently, reducing turbulence and dust accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional bladed fans and fan heaters are used, then air flow can be generated, but the air flow becomes turbulent and non-uniform due to blade surface variations
Solution Approach 1:
The patent removes the traditional bladed fan component entirely and replaces it with a bladeless design that uses a nozzle and Coanda surface to generate air flow. This extraction of the problematic blade element eliminates the source of turbulence and non-uniformity while maintaining the core function of air movement.
Solution Approach 2:
The patent replaces the mechanical blade rotation system with a different mechanism involving a nozzle and Coanda surface that utilizes fluid dynamics principles. This substitution transitions from a traditional mechanical fan system to an alternative system that inherently produces smoother, more uniform air flow without the turbulence caused by blade edges and surface variations.
2Object-affected harmful factors
If heat radiating coils are enclosed in a moulded apertured casing, then user safety is improved by preventing contact with hot surfaces, but cleaning becomes difficult and dust accumulates
Solution Approach 1:
The patent removes the traditional enclosed casing structure that housed the heat radiating coils and blades. By extracting this enclosing structure, the design eliminates the trap where dust accumulates and cleaning becomes difficult, while maintaining safety through the bladeless design and alternative heating approach.
Solution Approach 2:
The patent discards the traditional moulded apertured casing design that created cleaning difficulties. The new design allows for easier maintenance and cleaning while recovering the safety function through different means, such as the bladeless construction and controlled heating elements that do not require enclosed protection.
3Power
If heat radiating coils operate at high power output, then heating efficiency is improved, but dust on the coils burns and emits unpleasant odors
Solution Approach 1:
The patent removes the traditional heat radiating coils that were prone to accumulating and burning dust. By extracting this component and replacing it with an alternative heating mechanism, the design eliminates the problem of burnt dust odors while maintaining high heating power output through more efficient heating elements.
Solution Approach 2:
The patent replaces the long-lasting but dust-prone heat radiating coils with alternative heating elements that may have different operational characteristics. The new heating system is designed to operate in a manner that prevents dust accumulation and combustion, even if the heating elements have different service life characteristics.
4Temperature
If traditional fan heater design is used, then heating function is provided, but the heated air flow loses energy and velocity rapidly due to turbulence
Solution Approach 1:
The patent removes the bladed fan that created turbulent air flow and rapid energy loss. By extracting this component and using a bladeless design with nozzle and Coanda surface, the system generates laminar, uniform air flow that maintains heat energy and velocity over longer distances, improving heating efficiency.
Solution Approach 2:
The patent replaces the mechanical blade-based air movement system with a nozzle and Coanda surface-based system that produces smoother air flow. This substitution reduces turbulence-induced energy loss and maintains heating effectiveness over greater distances by preserving the kinetic energy and temperature of the heated air stream.
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 design provides a uniform and efficient air flow that maintains heat distribution over distance, reduces turbulence, and prevents dust from burning, resulting in a cleaner and safer heating experience.
Implementation Method 1
a heater for heating the air flow
Implementation Method 2
a nozzle with a Coanda surface and diffuser to create a uniform air flow
Data Source
AI summary
A bladeless fan assembly for creating an air current includes a nozzle mounted on a base housing a device for creating an air flow. The nozzle includes an interior passage for receiving the air flow and a mouth for emitting the air flow. The nozzle defines, and extends about, an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth. The nozzle also includes a heater for heating the air flow upstream of the mouth.