Reverse Forward Pitch Fan Blades for Confined Airflow
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Solution Overview
Problem
Conventional fans require ample space to create sufficient airflow, which is not feasible in limited areas, necessitating a fan design that can efficiently circulate air in smaller spaces.
Innovation Solution
A fan design with an even number of blades, where half are angled with a reverse pitch to draw air into a chamber and the other half with a forward pitch to extract and push air back into the room, creating pressurized air circulation within a defined chamber, allowing for effective airflow in confined areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional fan is used, then sufficient airflow can be achieved, but ample space is required between the blades and the ceiling
Solution Approach 1:
The fan blades are divided into two distinct groups: a first set of blades configured to draw air into the chamber, and a second set of blades configured to push air out of the chamber. This segmentation allows each blade set to perform a specific function, enabling effective air circulation in confined spaces where conventional fans would require excessive clearance.
Solution Approach 2:
Different blade configurations are applied to different locations within the fan assembly. The first set of blades has a specific orientation and pitch to draw air in, while the second set has a different orientation and pitch to push air out. This local differentiation of blade properties enables the fan to create pressurized air circulation within a compact chamber.
2Volume of stationary object
If the fan operates in a confined area, then space is saved, but sufficient airflow cannot be achieved with conventional designs
Solution Approach 1:
The fan system creates dynamic air circulation within a compact chamber by using rotating blades with different configurations. The first set of blades dynamically draws air into the chamber while the second set dynamically pushes air out, creating a continuous circulation pattern that maintains high air circulation efficiency despite the limited chamber volume.
Solution Approach 2:
The blade parameters (orientation, pitch, configuration) are specifically changed between the first set and second set of blades. The first set of blades has parameters optimized for drawing air in, while the second set has parameters optimized for pushing air out. This parameter differentiation enables the fan to achieve effective air circulation within a smaller chamber volume.
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
This design enables efficient air circulation in smaller spaces by utilizing the angled blades to draw in and push out air, effectively utilizing the available space to enhance airflow without the need for extensive clearance.
Implementation Method 1
one half of the fan blades are angled with a reverse pitch that draws air from the room into chamber 128 wherein the air becomes pressurized. The other half of the fan blades are angled with a forward pitch that extracts air stored within chamber 128 and pushes the air back into the room.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A fan apparatus is described that comprises a rotational hub that defines a central axis, a first fan blade coupled to the rotational hub and extending radially outward from the central axis, wherein the first fan blade has a first pitch angle; a second fan blade coupled to the rotational hub and extending radially outward from the first central axis, wherein the second fan blade has a second pitch angle opposite the first pitch angle; and a housing that defines cylindrical interior volume with a central axis coaxial with the central axis of the rotational hub, wherein the first and second fan blades reside within the cylindrical interior volume.