Control method capable of preventing combustible refrigerant from entering indoor side during shutdown of air conditioner

Abstract

The invention relates to a control method capable of preventing a combustible refrigerant from entering an indoor side during shutdown of an air conditioner. The control method comprises the following steps of: controlling a compressor to perform low-frequency operation while receiving a shutdown signal, and judging whether the air conditioner operates in a heating mode or operates in a refrigerating mode; when pressure at an outlet end of the compressor is reduced to a preset value, switching the air conditioner to operate in the refrigerating mode; closing an electronic expansion valve; and when pressure at an inlet end of the compressor is reduced to the preset value, controlling the compressor to stop operation, and closing a solenoid valve. The control method has the advantages that: the refrigerant positioned in the indoor side of the air conditioner can be completely absorbed out and stored in the outdoor side of the air conditioner, so that only a little refrigerant leaves in the indoor side of the air conditioner under a shutdown state of the air conditioner, and therefore, concentration of the refrigerant is extremely small even the indoor side of the air conditioner has a leakage condition, and safety accidents such as a fire disaster are not caused.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a control method for preventing flammable refrigerant from entering the indoor side when the air conditioner is turned off. Background technique [0002] Existing air conditioners generally use R32 (difluoromethane) as a refrigerant to replace the original HCFCs (hydrochlorofluorocarbons) refrigerants, so as to achieve better environmental protection effects. But as we all know, R32 has a certain weak flammability, and after the existing air conditioner is turned off, there will be R32 refrigerant in the indoor unit, outdoor unit and the connecting pipe between the two of the air conditioner, so once the indoor unit of the air conditioner If there is a leakage problem on the side (the indoor unit and the connecting pipe located in the room), the R32 refrigerant will easily leak into the indoor space. When the concentration of the R32 refrigerant in the room reaches a certain level, it will e...

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Problems solved by technology

But as we all know, R32 has a certain weak flammability, and after the existing air conditioner is turned off, there will be R32 refrigerant in the indoor unit, outdoor unit and the connecting pipe between the two of the air conditioner, so once the indoor unit of the air conditioner If there is a leakage problem on the side (the indoor unit and the connecting pipe located in the room), the R32 refrigerant will easily leak into the indoor space. When the concentration of the R32 refrigerant in the room reaches a certain level, it will easily cause fire and other safety accidents.

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