Refrigeration control method and device and air conditioner

Abstract

The embodiment of the invention discloses a refrigeration control method and device and an air conditioner and relates to the technical field of temperature control. It can be guaranteed that on the basis of reliability of the air conditioner, low-temperature refrigeration of the air conditioner is achieved. According to the specific scheme, the current value of the outdoor environment temperature is acquired, when the current value of the outdoor environment temperature is higher than a first preset temperature and lower than a second preset temperature, a compressor of the air conditioner is controlled to run under the frequency within a first running frequency interval, and an outdoor unit fan of the air conditioner is controlled to run at a rotating speed within a first rotating speed interval; and the frequency lower limit value of the first running frequency interval and the rotating speed upper limit value of the first rotating speed interval are running frequency of the compressor and the rotating speed of the outdoor unit fan respectively when the air conditioner performs refrigeration at the first preset temperature and the compression ratio of the compressor is at least the recommended compression ratio. The refrigeration control method and device are used in the temperature adjusting process of the air conditioner.

Description

technical field [0001] The invention relates to the technical field of temperature control, in particular to a refrigeration control method, device and air conditioner. Background technique [0002] An air conditioner is an air conditioner, which is a common household appliance that can usually have heating and cooling functions. [0003] Specifically, the refrigeration process of the air conditioner may include: compressing the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant through a compressor; the high-temperature and high-pressure gaseous refrigerant is sent to the condenser of the outdoor unit for heat dissipation, and then becomes a high-pressure liquid refrigerant. The heat dissipated during the process from gaseous to liquid is discharged outdoors through the fan of the outdoor unit; after the liquid refrigerant enters the evaporator of the indoor unit after passing through a filter and a throttling device (such as an e...

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Problems solved by technology

[0004] However, there is a problem that when the air conditioner is operating at a low temperature below the outdoor temperature of 0°C, due to the low outdoor ambient temperature, the heat transfer temperature difference of the condenser (that is, the condenser receives high-temperature and high-pressure gas from the compressor) The difference between the temperature of the refrigerant and the outdoor temperature) becomes larger, the heat release in the condensation process increases, and the high pressure does not rise, resulting in a smaller compression ratio of the compressor, which in turn leads to a decrease in the circulation of the refrigerant and a decrease in the cooling capacity of the indoor unit

In this case, if the air conditioner continues to cool, the compression ratio of the compressor will continue to decrease. When the compression ratio of the compressor is lower than the minimum compression ratio of the compressor, the compressor working under abnormal compression ratio will affect the return of the air conditioner. Oil and the lubrication of the compressor motor will ultimately affect the reliability of the compressor, which in turn will affect the reliability of the air conditioner

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