Oil return control method and device of air conditioning system, storage medium and air conditioning system
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Solution Overview
Problem
In three-pipe air conditioning systems, lubricating oil fails to return smoothly to the compressor during refrigerating-alone or heating-alone modes, affecting system performance and leading to potential accumulation and reduced reliability.
Innovation Solution
An oil return control method that sequences the communication of compressor, heat exchangers, pipelines, and a gas-liquid separator to form refrigerant circulation loops, using electromagnetic and four-way valves to drive lubricating oil back to the compressor, ensuring efficient oil return without disrupting normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air conditioning system operates in refrigerating-alone or heating-alone mode, then the system provides comfortable environment for people with different indoor requirements, but the lubricating oil in the pipeline cannot smoothly return to the compressor
Solution Approach 1:
The system performs oil return operation in advance during refrigerating-alone or heating-alone modes before entering simultaneous refrigerating and heating mode. The controller controls the compressor to operate at high frequency and opens relevant electromagnetic valves to create oil circulation conditions, ensuring oil returns to the compressor before the system switches modes, thus preventing oil accumulation and ensuring reliable operation.
Solution Approach 2:
The system implements periodic oil return operations by controlling the compressor to operate at high frequency for specific time periods during refrigerating-alone or heating-alone modes. The controller periodically activates the oil return sequence by opening electromagnetic valves and maintaining high frequency operation, creating periodic oil circulation that ensures continuous oil return without disrupting normal system operation.
2Productivity
If the compressor operates at high frequency for oil return, then the oil return efficiency is improved, but the operating time duration increases
Solution Approach 1:
The system applies partial action by operating the compressor at high frequency only for the specific duration needed to complete oil return, rather than continuous high frequency operation. The controller monitors the oil return process and stops the high frequency operation once the oil has returned to the compressor, avoiding unnecessary extended operation time while ensuring complete oil return.
Solution Approach 2:
The system uses feedback control to monitor the oil return process. The controller detects when oil has successfully returned to the compressor during high frequency operation and automatically adjusts or stops the high frequency operation accordingly. This feedback mechanism ensures oil return efficiency is maintained while minimizing the total operating time duration by stopping the process as soon as the oil return is complete.
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
The method ensures high oil return efficiency, prevents lubricating oil accumulation, and maintains system reliability by guaranteeing the required lubricating oil amount for the compressor, thus improving the stability and performance of the air conditioning system.
Implementation Method 1
a gas-liquid separator, a first pipeline, a second pipeline and a third pipeline connected between the compressor and the indoor heat exchanger connected in sequence to form refrigerating and heating circulation
Data Source
AI summary
An air conditioning system includes a storage medium and an air conditioning system, for a three-pipe air conditioning system, the three-pipe air conditioning system includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator, a first pipeline, a second pipeline and a third pipeline; the oil return control method comprises the following steps: controlling the compressor to operate at a first frequency in a refrigerating mode; judging whether the operation duration of the refrigerating mode reaches a first preset time or not; if so, the air conditioning system enters an oil return state, and the compressor, the third pipeline, the second pipeline and the gas-liquid separator are controlled to be communicated in sequence to form a refrigerant circulation loop.