Methods and systems for detecting blockage in a filter mesh of indoor unit
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Solution Overview
Problem
Existing air conditioners lack an effective method to accurately detect blockages in the filter mesh of their indoor units, which affects heat exchange performance and air filtration efficiency.
Innovation Solution
A method and apparatus that determine blockages in the filter mesh by calculating the resistance difference value and external static pressure value, using a numerical relationship to assess the filter's condition and provide timely and accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no detection function is provided for the filter mesh, then the device complexity is reduced, but the measurement precision of filter blockage is lost
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the static pressure difference across the filter mesh and comparing it against threshold values. The control unit receives pressure data from sensors, processes this information, and provides feedback about filter blockage status to the user interface, enabling accurate detection without complex mechanical inspection systems
Solution Approach 2:
The patent replaces potential mechanical inspection methods with a pneumatic sensing system. By using static pressure sensors to detect changes in air pressure across the filter, the system substitutes mechanical blockage detection with a non-contact, electronically-based measurement approach, reducing overall system complexity while improving measurement precision
2Reliability
If filter blockage is not detected timely, then the ease of operation is maintained, but the heat exchange performance deteriorates
Solution Approach 1:
The patent performs preliminary detection of filter blockage by continuously monitoring static pressure differences before significant performance degradation occurs. The system proactively identifies blockage conditions through pressure threshold comparisons and provides advance warning to users, allowing them to maintain optimal heat exchange performance through timely filter maintenance without complicating the user experience
Solution Approach 2:
The system enables self-service operation by automatically monitoring filter condition and providing clear blockage warnings without requiring user intervention or technical knowledge. The control unit autonomously processes sensor data, compares it against predetermined thresholds, and communicates filter status through the user interface, maintaining operational simplicity while ensuring reliability
3Measurement precision
If external static pressure value is not considered, then the device complexity is reduced, but the measurement precision of blockage detection deteriorates
Solution Approach 1:
The patent segments the pressure measurement task into two distinct components: a first static pressure sensor measures the static pressure upstream of the filter, while a second static pressure sensor measures the static pressure downstream of the filter. This segmentation allows the system to calculate the pressure difference across the filter independently, improving blockage detection accuracy without requiring a single complex pressure measurement system
Solution Approach 2:
The control unit acts as an intermediary that receives raw pressure data from both static pressure sensors, processes this information by calculating the pressure difference, and compares it against threshold values. This intermediary processing layer enables accurate blockage detection by translating raw sensor readings into meaningful diagnostic information without adding significant system complexity
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 timely and accurate detection of filter blockages, improving the accuracy and instantaneity of determining when the filter needs cleaning or replacement, thereby maintaining the air conditioner's performance and filtration efficiency.
Implementation Method 1
obtain a first resistance difference value of the filter mesh under a preset air volume value; determining a first external static pressure value in an operating process of the indoor unit
Data Source
AI summary
A method for detecting a blockage in a filter mesh of an indoor unit includes: obtaining a first resistance difference value of the filter mesh under a preset air volume value; determining a first external static pressure value during an operation process of the indoor unit; and determining that the filter mesh is blocked based on a numerical relationship between the first external static pressure value, the preset external static pressure value, and the first resistance difference value. The blockage of the filter mesh may be determined in time during the operation process of the air conditioner.