Temperature adjustment device, control method therefor, control apparatus thereof, and storage medium
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Solution Overview
Problem
The use of R32 refrigerant in air conditioners leads to high exhaust air temperatures, causing compressor refrigerant oil dilution and abnormal wear due to unmeasurable return air dryness, which reduces compressor reliability.
Innovation Solution
A method and apparatus for detecting compressor return air dryness by calculating a temperature difference value based on exhaust and return air temperatures and pressures, along with working frequency, to determine and adjust the compressor's operation state for accurate dryness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid-carrying return air technology is used to lower exhaust air temperature, then exhaust air temperature is reduced, but return air dryness cannot be measured leading to compressor refrigerant oil dilution and abnormal wear
Solution Approach 1:
The patent implements feedback control by continuously monitoring compressor operating parameters (current, voltage, frequency, evaporating temperature, condensing temperature) and using this information to dynamically adjust the degree of liquid-carrying return air through electronic expansion valve control. This closed-loop feedback system ensures the return air dryness remains within safe limits while maintaining low exhaust air temperature, thereby preventing compressor refrigerant oil dilution and abnormal wear.
Solution Approach 2:
The patent replaces traditional mechanical dryness measurement methods with an electronic calculation system that determines return air dryness by processing electrical and thermal parameters (current, voltage, frequency, temperatures) through computational algorithms. This substitution enables precise, real-time dryness assessment without mechanical intervention, allowing for accurate control of the liquid-carrying return air process.
2Device complexity
If return air dryness is not measured, then system operation is simple, but compressor refrigerant oil dilution and abnormal wear occur
Solution Approach 1:
The patent replaces complex mechanical dryness measurement devices with an electronic parameter-based calculation system. By measuring easily obtainable electrical parameters (current, voltage, frequency) and thermal parameters (temperatures) and processing them through computational algorithms, the system achieves accurate return air dryness determination without requiring complex mechanical instrumentation, thus maintaining system simplicity while ensuring compressor reliability.
Solution Approach 2:
The patent introduces an intermediary calculation model that uses readily measurable parameters (current, voltage, frequency, temperatures) as mediators to indirectly determine return air dryness. Instead of directly measuring dryness which would require complex equipment, the system uses these intermediary parameters that are already available in the control system to compute the dryness value, simplifying the overall measurement system while maintaining accuracy.
Data Source
AI summary
A compressor return air dryness detection method includes: obtaining an exhaust air pressure, a return air pressure, a working frequency, an exhaust air temperature, and a return air temperature of a compressor; determining a return air saturation temperature corresponding to the return air pressure; calculating a temperature difference value based on the return air temperature and the return air saturation temperature; and in accordance with a determination that the temperature difference value is smaller than a predetermined threshold value, calculating a return air dryness of the compressor based on the exhaust air pressure, the return air pressure, the working frequency, and the exhaust air temperature.