Method for cleaning indoor unit and outdoor unit of air conditioner
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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 the outdoor unit is neglected or poorly executed.
Innovation Solution
A method that adjusts the operating frequency, fan speed, and throttling device opening to maintain a stable evaporating temperature for frosting, followed by controlled defrosting, ensuring the differential pressure meets preset conditions to avoid compressor shock and ensure thorough cleaning of both indoor and outdoor heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
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 dynamically adjusts operating parameters (evaporating temperature, fan speed, compressor frequency) based on real-time pressure difference detection. When pressure difference exceeds threshold, the system modifies these parameters to maintain stable operation during the cleaning cycle, preventing compressor shock while ensuring effective cleaning.
Solution Approach 2:
The system continuously monitors pressure difference between high and low pressure sides during self-cleaning operation. Based on this feedback, it automatically adjusts operating parameters or controls the four-way valve switching timing to ensure pressure difference remains within safe limits, thereby preventing compressor damage while maintaining cleaning effectiveness.
2Manufacturing precision
If evaporating temperature is lowered for frosting cleaning, then cleaning capability is improved, but pressure difference increases causing compressor shock
Solution Approach 1:
The patent employs dynamic control of evaporating temperature rather than a fixed low temperature setting. The system adjusts temperature in real-time based on pressure difference feedback, allowing the heat exchanger to reach sufficient frosting for cleaning while preventing excessive pressure buildup that would cause compressor shock.
Solution Approach 2:
The system detects pressure difference trends in advance and takes preventive actions (adjusting parameters, controlling valve switching) before the pressure difference becomes excessive. This proactive approach prevents compressor shock while maintaining effective cleaning conditions.
3Productivity
If four-way valve switching is performed quickly, then cleaning efficiency is improved, but compressor shock increases due to pressure difference
Solution Approach 1:
The system uses real-time pressure difference feedback to control the timing and speed of four-way valve switching. When pressure difference is within safe limits, switching can proceed efficiently; when pressure difference approaches dangerous levels, the system delays or slows switching, ensuring compressor protection while maintaining overall cleaning efficiency.
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 allows for stable and reliable air conditioner operation by ensuring efficient frosting and defrosting, effectively removing dust and preventing bacterial growth while minimizing compressor stress through controlled pressure management.
Implementation Method 1
enabling a surface of the to-be-cleaned heat exchanger to frost
Implementation Method 2
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 3
performing a defrosting switching to indoor and outdoor heat exchangers
Data Source
Figure 1
AI summary
The present invention discloses a method for cleaning an air conditioner indoor unit and outdoor unit. The method includes: controlling a to-be-cleaned 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 to-be-cleaned heat exchanger, and maintaining an evaporating temperature of the to-be-cleaned heat exchanger within a present range, so as to enable a surface of the to-be-cleaned heat exchanger to frost; keeping the to-be-cleaned heat exchanger frosting for a time of t1; detecting whether a differential pressure between a high pressure and a low pressure of the air conditioner meets a preset condition; when the differential pressure between the high pressure and the low pressure of the air conditioner meets the preset condition, controlling a four-way valve to change a direction, so as to perform a defrosting switching to indoor and outdoor heat exchangers; and when the differential pressure between the high pressure and the low pressure of the air conditioner does not meet the preset condition, adjusting an operating parameter of the air conditioner to enable the differential pressure between the high pressure and the low pressure of the air conditioner to meet the preset condition, and then controlling the four-way valve to change the direction, so as to perform a defrosting switching to the indoor and outdoor heat exchangers. A direction change of the four-way valve may be controlled by detecting whether the differential pressure between the high pressure and the low pressure of the air conditioner meets the preset condition. Therefore, a great shock to the compressor because of an excessive differential pressure between the high pressure and the low pressure of the air conditioner may be avoided.