Air Duct Gas Filter Layout for Quiet Low-Pressure Purification
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Solution Overview
Problem
Existing air purifying systems, particularly those for domestic use, face challenges in efficiently removing harmful gases while minimizing pressure drop and noise, as conventional designs force air through gas filters, leading to increased fan speeds and noise, which is undesirable for quiet operation.
Innovation Solution
The air purifier system incorporates a gas filter disposed in the air flow direction within the air duct, using a resilient material like activated carbon, and a radial fan to ensure efficient gas filtration with minimal pressure drop, along with a HEPA particulate filter and optional pre-filter, allowing air to pass over the gas filter rather than through it, and includes a sensor for adjusting operational parameters based on gas concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas filter is disposed to cross the air flow direction to force air through them, then gas filtration effectiveness is improved, but pressure drop increases and noise increases
Solution Approach 1:
Instead of forcing air through the gas filter by positioning it perpendicular to airflow, the patent inverts the approach by positioning the gas filter parallel to airflow direction, allowing air to pass over the filter surface. This eliminates the pressure drop issue while maintaining gas filtration effectiveness through extended contact time and surface area exposure.
Solution Approach 2:
The patent transitions from a one-dimensional filtration approach (air forced through filter media) to a two-dimensional approach (air flowing over filter surface). The gas filter is positioned with its filtration surface parallel to airflow, creating a different dimensional interaction between air and filter media that reduces resistance while maintaining contact.
2Reliability
If gas filter is disposed to cross the air flow direction to force air through them, then gas filtration effectiveness is improved, but noise increases due to increased fan speeds
Solution Approach 1:
The patent inverts the conventional filtration approach by positioning the gas filter parallel to airflow rather than perpendicular. This eliminates the need for high fan speeds to force air through the filter, thereby reducing noise generation while maintaining filtration effectiveness through extended air-filter contact time.
3Adaptability or versatility
If gas filter comprises resilient or bendable material, then adaptability to system design is improved, but structural strength may be reduced
Solution Approach 1:
The patent employs resilient or bendable material for the gas filter, allowing the filter to conform to various duct shapes and installation configurations. This flexibility enables adaptation to different system designs while the filter frame or support structure maintains sufficient structural strength for installation and operation.
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 effectively removes harmful gases with reduced energy consumption and noise, maintaining performance and efficiency, making it suitable for quiet operation in domestic environments like bedrooms.
Implementation Method 1
the gas filter is a carbon filter such is known in the art. Preferably, it is an activated carbon filter
Implementation Method 2
a removable particulate filter
Data Source
AI summary
A domestic air purifier system comprising a removable particulate filter (4), a fan (2) or impeller and which is powered by a motor, an air duct (1) through which air passes in an air flow direction and is purified, and said air duct (1) comprising a duct wall and wherein a portion of said duct wall (1) comprises a gas filter (3) and a method of removing unwanted gases from ambient air by passing over a gas filter in such a system.