Method for controlling air conditioner compressor frequency based on vibration of pipeline
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Solution Overview
Problem
Existing air conditioners face issues with resonance between the compressor and outdoor unit due to manufacturing errors and varying installation conditions, leading to noise and potential damage, as the resonance frequency points measured pre-factory are often different from actual occurrence points.
Innovation Solution
A control method that involves monitoring the vibration displacement of the pipeline connected to the compressor, calculating differences in vibration displacements over time, and adjusting the compressor's operating parameters to prevent resonance, including adjusting the frequency based on calculated differences and change trends to avoid pipeline damage and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonance frequency points are measured before the air conditioner leaves the factory, then the control system can avoid these frequency points, but manufacturing errors and different installation conditions cause the measured frequency points to differ from actual resonance points
Solution Approach 1:
The system performs preliminary scanning of resonance frequency points before actual operation by detecting vibration displacements at potential resonance frequencies. This preliminary detection allows the system to identify actual resonance points that may differ from factory measurements, and prepare avoidance strategies in advance.
Solution Approach 2:
The system continuously monitors vibration displacements of the pipeline during operation and uses this feedback to identify actual resonance frequency points. Based on the detected resonance points, the control system dynamically adjusts compressor frequency to avoid resonance, creating a closed-loop control that adapts to actual installation conditions.
2Productivity
If the compressor operates at high frequency to improve cooling efficiency, then productivity increases, but the risk of encountering resonance frequency points increases
Solution Approach 1:
The system dynamically adjusts the compressor operating frequency based on real-time detection of vibration displacements. When resonance is detected or anticipated, the frequency is adjusted to avoid resonance points. This dynamic adjustment allows the system to maintain high productivity when operating away from resonance while avoiding the harmful effects of resonance when encountered.
Solution Approach 2:
The control system changes the operating parameter (frequency) of the compressor to avoid resonance frequency points. By detecting vibration patterns and identifying resonance frequencies, the system adjusts the frequency parameter to values that do not cause resonance, thereby maintaining productivity while avoiding harmful effects.
3Measurement precision
If the system scans for resonance frequency points during operation, then accurate resonance detection is achieved, but time is lost during the scanning process
Solution Approach 1:
The system performs partial scanning by focusing detection on specific frequency ranges or using reduced measurement intervals. Instead of exhaustive scanning across all possible frequencies, the system uses vibration displacement detection at key points and extrapolates resonance information, reducing scanning time while maintaining sufficient detection accuracy.
Solution Approach 2:
The system performs preliminary resonance detection during startup or low-load conditions before full operation begins. By identifying resonance frequency points early, the system avoids time loss during critical high-load operation, as the resonance map is already established for quick reference during normal 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 method effectively detects real-time vibration conditions and adjusts compressor parameters to prevent resonance, enhancing the accuracy of detecting potential resonance issues and improving user experience by reducing noise and preventing damage to the outdoor unit.
Implementation Method 1
the compressor will constantly produce vibration during the operation, which will inevitably cause the outdoor unit to vibrate therewith
Implementation Method 2
there must be some operating frequencies that will cause a resonance between the compressor and the outdoor unit
Data Source
AI summary
To solve the problem that a resonance phenomenon occurs between an outdoor unit and a compressor of existing air conditioners, embodiments include a compressor and a pipeline connected to the compressor. A control method includes obtaining a vibration displacement of the pipeline during the operation of the air conditioner and recording it as a first vibration displacement; obtaining the vibration displacement of the pipeline again after time has elapsed and recording it as a second vibration displacement; and selectively adjusting operating parameters of the compressor according to the first vibration displacement and the second vibration displacement. The vibration condition of the outdoor unit is determined through the real-time vibration condition and the vibration change condition of the pipeline so the air conditioner can selectively change the operating parameters of the compressor according to the vibration condition. Thus the vibration condition of the compressor is changed to avoid pipeline damage.