Variable-frequency air conditioner and control method thereof

Abstract

The invention relates to a variable-frequency air conditioner and a control method thereof. The control method of the variable-frequency air conditioner is used for self-cleaning a refrigerant pipeline of the variable-frequency air conditioner, and the variable-frequency air conditioner is provided with a compressor for compressing a refrigerant. The control method of the variable-frequency air conditioner comprises the following steps that when the compressor runs at a running frequency lower than a first preset frequency for a first preset duration, the running frequency of the compressor isincreased to a second preset frequency so as to accelerate the flowing speed of the refrigerant in the refrigerant pipeline, so that at least part of lubricating oil retained in the refrigerant pipeline returns to the compressor along with the refrigerant, enough lubricating oil for lubricating is guaranteed in a cylinder body of the compressor, the amount of the lubricating oil in the refrigerant pipeline can be timely reduced, the heat exchange effect of the refrigerant pipeline is improved, and meanwhile, the effect of self-cleaning the refrigerant pipeline is achieved. The variable-frequency air conditioner comprises the refrigerant pipeline for circulating the refrigerant, the compressor and a controller which is used for controlling the operation of the compressor.

Description

technical field [0001] The invention relates to an air conditioner, in particular to an inverter air conditioner and a control method thereof. Background technique [0002] As the heart of the air conditioner, the performance of the compressor is crucial. In order to ensure the normal operation of the compressor, a certain amount of lubricating oil will be injected into the cylinder of the compressor to play the role of cooling and lubrication. The ideal effect of compressor operation is that the lubricating oil only needs to stay in the pressure cylinder to protect the gas, but in actual operation, because the lubricating oil and the refrigerant are in the same pipeline system, the lubricating oil will merge with the refrigerant, and part of the lubricating oil will be discharged to the In the refrigerant pipeline of the air conditioner. As time goes on, the lubricating oil in the compressor continues to decrease, and the lubricating oil in the refrigerant pipeline contin...

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Problems solved by technology

[0003] Aiming at the harm caused by the compressor lubricating oil remaining in the refrigerant pipeline, at present, only the oil return experiment of the compressor is used to verify the operation of the air conditioner in various environments, and the injection amount of the compressor lubricating oil is determined to ensure Under the environment, the compressor has enough lubricating oil for protection, but there is no solution to the poor cooling and heating effect caused by the increase of lubricating oil in the refrigerant pipeline

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