Oil return control method and device for compressor and air conditioner

Abstract

The invention provides an oil return control method and device for a compressor and an air conditioner. The control method for the compressor comprises the steps of acquiring the oil return starting frequency of the compressor and controlling the compressor to increase the frequency step by step in a segment frequency increase mode after an oil return mode of the compressor is started; acquiring the operation frequency of the compressor and the oil return time after the oil return mode is started; judgement whether or not the condition of stopping the oil return mode is met according to the operation frequency or the oil return time and the oil return starting frequency; and controlling the compressor to operate at a normal heating or refrigeration frequency when the condition of stoppingthe oil return mode is met so as to stop the oil return mode. According to the oil return control method and device, the operation frequency and the oil return time are used as conditions of judging whether or not the oil return mode is stopped, and the situation is avoided that since the increased frequency is too high, high-frequency protection is triggered, and thus oil return is stopped. It can be guaranteed that the oil return mode is stopped in time, and efficient high-quality oil return is achieved.

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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