Variable Speed Air Cleaning System with Centrifugal Stratification
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Solution Overview
Problem
Existing air cleaning systems are inefficient in meeting varying airflow requirements and often lead to filter plugging and frequent replacements, resulting in increased operational costs and reduced performance in devices like internal combustion engines and ventilation systems.
Innovation Solution
A powered air cleaning system with a motor-driven turbine-type fan capable of variable speed operation, utilizing a rotating flow to stratify debris-laden air and de-swirl blades to redirect clean air, along with an integrated motor controller to adjust airflow based on device requirements, enhancing airflow pressure and extending filter change intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor-driven fan operates at a single rated speed to satisfy maximum airflow requirement, then the maximum airflow requirement is met, but energy is wasted when airflow requirement is reduced and excess airflow flows through the ejector port
Solution Approach 1:
The motor-driven fan is designed with variable speed capability, allowing it to adjust its rotational speed dynamically based on the actual airflow requirements of the downstream device. This replaces the conventional fixed-speed operation, enabling the system to match airflow supply with demand and eliminate energy waste from excess airflow.
Solution Approach 2:
The system changes the operating parameter (fan speed) based on downstream device requirements. By varying the rotational speed parameter of the motor-driven fan, the system can provide exactly the airflow amount needed, preventing energy consumption from unnecessary airflow and reducing the harmful effect of excess air passing through the ejector port.
2Productivity
If the air cleaning system operates at maximum airflow requirement, then the maximum requirement is satisfied, but filter plugging occurs more frequently requiring replacement
Solution Approach 1:
The variable speed fan allows the system to operate at lower airflow rates when downstream device requirements are reduced, thereby reducing the rate at which debris accumulates on the filter. This dynamic adjustment extends filter service intervals and improves reliability by preventing premature filter plugging.
Solution Approach 2:
Instead of continuously operating at maximum airflow which causes excessive debris loading on the filter, the system applies partial action by operating at reduced speeds matched to actual requirements. This prevents excessive accumulation of debris on the filter medium, extending its service life.
3Productivity
If the system provides excess airflow to meet maximum requirement, then the maximum requirement is satisfied, but the excess air flows through the ejector port creating inefficiency
Solution Approach 1:
The variable speed motor-driven fan dynamically adjusts airflow output to match the actual requirements of the downstream device. This eliminates the creation of excess airflow that would otherwise be forced through the ejector port and wasted, thereby reducing energy loss.
Solution Approach 2:
The system incorporates feedback from the downstream device about its airflow requirements and adjusts the fan speed accordingly. This feedback mechanism ensures that airflow is supplied at the optimal rate, preventing energy waste from excess air passing through the ejector port.
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 system achieves higher operational efficiency, longer filter life, and improved airflow management by matching airflow rates to device demands, reducing energy consumption and operational costs while maintaining high cleaning efficiency.
Implementation Method 1
a motor-driven fan located along the flow path to draw particulate debris laden air into the inlet and rotate it about an axis to form a rotating flow that stratifies the debris laden air with the heaviest particles in the outermost orbits of the rotating flow
Implementation Method 2
at least one de-swirl blade located within the rotating flow for aerodynamically redirecting clean air from the innermost orbits of the stratified rotating flow toward the outlet. This results in straightening out the airflow thereby adding additional pressure out of the clean air outlet
Data Source
AI summary
A powered air cleaning system has a flow path extending through the system from an inlet to an outlet. A motor-driven fan is located along the flow path to draw particulate debris laden air into the inlet and rotate it about an axis to form a rotating flow that stratifies the debris laden air with the heaviest particles in the outermost orbits of the rotating flow. An ejector port ejects particulate debris laden air from the stratified rotating flow in the system. At least one de-swirl component located within the rotating flow aerodynamically redirects clean air from the innermost orbits of the stratified rotating flow toward the outlet to provide a positive airflow pressure out of the outlet. The system has a variable speed fan motor and an integrated controller for adjusting the speed of the motor and thereby the flow rate of clean air through the outlet of the system. The controller receives a signal that is a function of airflow requirements of a device supplied with clean air by the system. The system can be mounted above or below a hood housing an engine to be supplied with clean air.