Bladeless Fan Nozzle Heating for Uniform Warm Airflow
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Solution Overview
Problem
Conventional fan heaters produce non-uniform, turbulent air flows due to variations in blade surface and heating coil designs, leading to discomfort and inefficient heat distribution, with the added issue of dust accumulation and potential burning odors from high-temperature coils.
Innovation Solution
A bladeless fan assembly utilizing 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 flow efficiently, reducing turbulence and maintaining a safe external temperature to prevent dust burning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fan heaters use rotary blades and heat radiating coils, then heating function is provided, but turbulent air flow is generated causing discomfort and rapid heat loss with distance
Solution Approach 1:
The patent removes the traditional rotary blades from the fan heater system and replaces them with a nozzle that generates air flow through pressure differential. This extraction of the blade component eliminates the source of turbulent air flow while maintaining the heating function through the nozzle's air current
Solution Approach 2:
The patent combines the heating function and air flow generation into a single integrated nozzle structure. The nozzle serves dual purposes: generating air flow through pressure differential and providing a platform for heat radiating coils, thereby merging previously separate functions into one unified component
2Object-affected harmful factors
If heat radiating coils are enclosed within a moulded apertured casing, then user safety is improved, but dust accumulation occurs leading to burning odors
Solution Approach 1:
The patent removes the moulded apertured casing that enclosed the heat radiating coils and replaces it with an open framework structure. This extraction eliminates the enclosed space where dust could accumulate while maintaining user safety through the inherent design of the open framework that prevents direct contact with hot components
Solution Approach 2:
The patent discards the traditional enclosed casing design and recovers the safety function through a different approach - using the open framework structure with strategically positioned coils that are naturally protected from user contact while allowing free air flow and preventing dust accumulation
3Power
If fan heaters use high power output coils, then heating efficiency is improved, but dust burning occurs at temperatures exceeding 700°C
Solution Approach 1:
The patent removes the enclosed casing that trapped heat and dust around the coils. By extracting this enclosing structure, the system allows continuous air flow through the open framework, which prevents dust accumulation on the coils even when operating at high power output levels
Solution Approach 2:
The patent establishes continuous air flow through the nozzle and across the heat radiating coils. This continuous flow of fresh air prevents dust from settling on the coils during operation, thereby eliminating the condition that leads to dust burning even when high power output is maintained
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 generates a uniform and efficient air flow that maintains heat distribution over distance with reduced turbulence, preventing dust burning and unpleasant odors, providing a comfortable and effective heating or cooling experience.
Implementation Method 1
a nozzle with a Coanda surface and diffuser to create a uniform air flow
Implementation Method 2
a nozzle comprising an interior passage for receiving the air flow and a mouth for emitting the air flow, the nozzle defining and extending about an opening through which air from outside the fan assembly is drawn by the air flow emitted from the mouth
Implementation Method 3
a heater located within the nozzle or in the air path to heat the air flow efficiently
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.