Air Purifier
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Solution Overview
Problem
Air purifiers face a reduction in suction efficiency due to the possibility of purified air being sucked back into the inlet, as the air blown out is purified and has lower velocity than the unpurified air, leading to a higher likelihood of recirculation.
Innovation Solution
An air purifier design with two blowers and a filter, where the air inlet and outlet directions are orthogonal, and the outlet area is smaller than the inlet area, increasing air velocity and distance from the inlet, reducing the likelihood of air recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the air outlet area is made larger to increase air flow output, then the air purification capacity is improved, but the air velocity at the outlet decreases and the likelihood of air recirculation increases
Solution Approach 1:
The patent changes the geometric parameters of the air outlet by making its area smaller than the air inlet area. This parameter change increases the air velocity at the outlet according to the continuity equation, thereby preventing recirculation while maintaining adequate purification capacity through the two blower configuration.
2Productivity
If the air outlet area is made smaller to increase air velocity and prevent recirculation, then the suction efficiency is improved, but the air purification capacity is reduced
Solution Approach 1:
The patent divides the air handling system into two separate blower units, each with its own fan. This segmentation allows the system to maintain high air velocity through the smaller outlet area while achieving the required total air purification capacity through the combined output of both blowers.
3Device complexity
If the air inlet and outlet are positioned close to each other for compact design, then the device complexity is reduced, but the likelihood of air recirculation increases
Solution Approach 1:
The patent takes preliminary anti-action against recirculation by designing the air outlet area to be smaller than the air inlet area, which creates higher outlet air velocity that actively prevents purified air from being drawn back into the inlet, counteracting the tendency toward recirculation in compact designs.
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 effectively reduces the likelihood of air being sucked back into the inlet by increasing air velocity and distance, enhancing suction efficiency and air purification effectiveness.
Implementation Method 1
a filter disposed in the cavity portion. During rotation of the fan, the two blowers each suck in air from outside of the housing through the air inlet into the cavity portion, and blow the air having passed through the filter from the air outlet to the outside of the housing
Implementation Method 2
two blowers disposed in the cavity portion and each including a fan rotatable to generate a flow of air
Data Source
AI summary
An air purifier includes a housing having an air inlet, an air outlet, and a cavity portion connecting the air inlet and the air outlet, two blowers disposed in the cavity portion and each including a fan rotatable to generate a flow of air, and a filter disposed in the cavity portion. During rotation of the fan, the two blowers each suck in air from outside of the housing through the air inlet into the cavity portion, and blow the air having passed through the filter from the air outlet to the outside of the housing. A direction in which the air inlet is open crosses a direction in which the air outlet is open. An opening area of the air outlet is smaller than an opening area of the air inlet.