Method for cleaning air conditioner indoor unit and outdoor unit
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Solution Overview
Problem
Air conditioners face instability and incomplete cleaning of heat exchangers due to excessive pressure differences during self-cleaning, leading to inefficient heat exchange and potential compressor shock, especially when cleaning outdoor units which are often neglected and difficult to access.
Innovation Solution
A method that controls the air conditioner to enter a self-cleaning mode, adjusts operating parameters to maintain evaporating temperature, and detects differential pressure to safely switch defrosting between indoor and outdoor heat exchangers, ensuring stable operation by managing fan speeds, compressor frequency, and throttling device openings to maintain preset pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self cleaning mode is activated for heat exchanger, then cleaning effect is improved, but excessive pressure difference causes compressor shock and operation instability
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting operating parameters (evaporating temperature, evaporating pressure, fan speed, compressor frequency) during the self-cleaning process. The control method monitors pressure difference in real-time and modifies system parameters to maintain pressure difference within safe ranges, preventing compressor shock while ensuring effective heat exchanger cleaning.
Solution Approach 2:
The patent implements feedback control by continuously detecting the pressure difference between high and low pressure sides during self-cleaning operation. When the detected pressure difference exceeds preset thresholds, the system automatically adjusts operating parameters or terminates the cleaning cycle, creating a closed-loop control system that ensures safe operation while maintaining cleaning effectiveness.
2Adaptability or versatility
If four-way valve switching is performed during self cleaning, then defrosting function is improved, but excessive pressure difference during switching causes compressor shock
Solution Approach 1:
The patent applies preliminary action by performing preparatory checks of pressure difference conditions before allowing four-way valve switching during self-cleaning mode. The system detects whether evaporating pressure and condensing pressure meet preset requirements before initiating the switching sequence, ensuring that valve switching occurs only under safe pressure conditions that prevent compressor shock.
Solution Approach 2:
The patent adjusts operating parameters (evaporating temperature, pressure ratios) before and during four-way valve switching to maintain pressure difference within safe ranges. By dynamically modifying system parameters, the patent enables defrosting functionality while protecting the compressor from damage during the critical switching transition.
3Productivity
If outdoor unit heat exchanger is cleaned, then heat exchange efficiency is improved, but manual cleaning is difficult due to wall proximity and incomplete cleaning results
Solution Approach 1:
The patent applies self-service by enabling the air conditioner system to clean its own heat exchanger automatically without requiring manual intervention. The self-cleaning mode utilizes the system's existing components (compressor, four-way valve, fans) to perform defrosting and cleaning of the outdoor unit heat exchanger, eliminating the need for difficult manual access while achieving complete and effective cleaning results.
4Ease of manufacture
If evaporating temperature and evaporating pressure are low during self cleaning, then cleaning capability is improved, but pressure difference becomes excessive causing operation instability
Solution Approach 1:
The patent dynamically adjusts evaporating temperature and evaporating pressure parameters during self-cleaning operation to maintain optimal cleaning capability while preventing excessive pressure difference. By modulating compressor frequency, fan speed, and throttling device opening, the system keeps pressure ratios within safe ranges, ensuring both effective cleaning and operational stability.
Solution Approach 2:
The patent implements real-time feedback monitoring of evaporating pressure and condensing pressure during self-cleaning. When pressure difference approaches dangerous thresholds, the control system automatically adjusts operating parameters or terminates the cleaning cycle, creating a safety mechanism that prevents compressor damage while maintaining cleaning effectiveness under normal conditions.
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 ensures stable and reliable air conditioner operation by efficiently cleaning heat exchangers, preventing compressor shock and improving defrosting efficiency while maintaining heat exchange effectiveness.
Implementation Method 1
adjusting an operating frequency of an air conditioner, an opening of a throttling device, and a corresponding fan speed of the to-be-cleaned heat exchanger, and maintaining an evaporating temperature of the to-be-cleaned heat exchanger within a preset range, so as to enable a surface of the to-be-cleaned heat exchanger to frost
Implementation Method 2
controlling a four-way valve to change a direction, so as to perform a defrosting switching to indoor and outdoor heat exchangers
Data Source
AI summary
A method for cleaning an air conditioner indoor unit and outdoor unit includes controlling a heat exchanger to enter a self-cleaning mode, adjusting an operating frequency of an air conditioner, an opening of a throttling device, and a corresponding fan speed of the heat exchanger, and maintaining an evaporating temperature of the heat exchanger within a present range to enable a frost process on a surface of the heat exchanger. When a differential pressure of the air conditioner meets a preset condition, a four-way valve changes a direction, switching defrosting to indoor and outdoor heat exchangers. When the differential pressure does not meet the preset condition, the air conditioner is adjusted to meet the preset condition and the four-way valve direction is changed to perform a defrosting switching to the indoor and outdoor heat exchangers.