Compressor oil return control method, device and air conditioner

Abstract

The invention provides a compressor oil return control method, device and air conditioner. The control method includes: after the compressor oil return mode is turned on, obtaining the compressor's oil return initial frequency, and controlling the compressor The compressor is upgraded step by step in the step-by-step up-frequency mode; obtain the operating frequency of the compressor and the oil return time after the oil return mode is turned on; according to the operating frequency or the oil return time, and the oil return The starting frequency judges whether the conditions for exiting the oil return mode are met; when the conditions for exiting the oil return mode are met, the compressor is controlled to run at a normal heating or cooling frequency to exit the oil return mode. By using the operating frequency and the oil return time as the judgment conditions for whether to exit the oil return mode, the present invention avoids the high frequency increase and triggers high-frequency protection, so that the oil return is terminated; Return oil.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a compressor oil return control method and device and an air conditioner. Background technique [0002] During the operation of the inverter air conditioner, the lubricating oil will be discharged from the compressor along with the refrigerant and enter the evaporator, condenser and piping. Only when the discharged lubricating oil returns to the compressor smoothly, can the dynamic balance of the lubricating oil in the entire system be maintained, otherwise, the heat exchange effect of the evaporator and condenser will be deteriorated, which will seriously affect the heat exchange effect and system performance. At the same time, the compressor will be damaged due to lack of oil. [0003] The solution commonly used in the prior art is to adopt a timing oil return mode, such as: when the compressor runs for 1.5 hours, the oil returns for ten minutes, which is a cycle and ...

AI Technical Summary

Problems solved by technology

However, this mode ignores the actual operating status of the compressor. During the frequency increase process, the frequency of the compressor is likely to be too high, causing the system to trigger high-frequency protection, resulting in too short oil return time, and causing serious oil shortage when the compressor is running. ; In addition, it is impossible to accurately judge whether the oil return volume has met the demand. It may appear that when the oil return volume is sufficient, the compressor is still outputting at high frequency, which reduces the energy efficiency of the whole machine.

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