Air purifier and air purification method
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Solution Overview
Problem
Current air purifiers lack a reliable and cost-effective method for in-situ monitoring of gas filter lifetime, often requiring laboratory tests or expensive instruments, which can lead to inaccurate filter condition assessment and potential exposure to air pollution.
Innovation Solution
An air purifier equipped with a concentration sensor having a first and second electrode, exposed to upstream and downstream air flows respectively, processes the concentration difference to determine the gas filter's condition, providing real-time and low-cost filter lifetime indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory CADR degradation checks or expensive professional instruments are used to detect gas filter lifetime, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential measurement function from complex laboratory equipment by using a simple differential pressure gauge to measure only the pressure drop across the gas filter, which directly indicates filter loading and lifetime without requiring full CADR degradation testing equipment
Solution Approach 2:
The patent introduces a differential pressure gauge as an intermediary measurement device that indirectly assesses gas filter condition through pressure drop measurement, avoiding the need for direct complex gas concentration analysis while providing reliable lifetime indication
2Measurement precision
If two independent sensors are employed at both sides of the filter to check pollutant concentration difference, then measurement capability is improved, but reliability deteriorates due to sensor-to-sensor variation
Solution Approach 1:
The patent combines the measurement function into a single differential pressure gauge that directly measures the pressure difference across the filter, eliminating the need for two separate sensors and their associated calibration and matching issues while maintaining measurement reliability
3Ease of operation
If airflow accumulation monitoring is used for filter lifetime indication, then ease of operation is improved, but measurement precision deteriorates as it does not reflect real filter conditions
Solution Approach 1:
The patent implements real-time feedback monitoring of the actual filter condition through continuous pressure drop measurement, allowing the system to accurately reflect the true filter state and provide dynamic lifetime indication based on actual loading rather than predetermined airflow accumulation
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 solution enables accurate, real-time detection of gas filter lifetime, reducing the risk of ineffective filtration and unnecessary filter replacements, ensuring clean air delivery with improved reliability and cost-effectiveness.
Implementation Method 1
a concentration sensor comprising a first electrode and a second electrode, the first electrode being exposed to the upstream air flow and the second electrode exposed to the downstream air flow, the concentration sensor providing an output signal based on the difference in concentrations of a target gas at the first and second electrodes
Data Source
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AI summary
An air purifier comprise a gas filter between an upstream air flow and a downstream air flow and a concentration sensor comprising a first electrode and a second electrode, the first electrode being exposed to the upstream air flow and the second electrode exposed to the downstream air flow, the concentration sensor providing an output signal based on the difference in concentrations of a target gas at the first and second electrodes. The output signal is processed to determine information relating to the condition of the gas filter.