Air conditioner and its control method

Abstract

The invention discloses an air conditioner, which comprises a frequency conversion compressor, a fixed frequency compressor and a flash evaporator arranged in parallel. The refrigerant transferred between the heat exchangers undergoes vapor-liquid separation, and the gas outlet of the flash evaporator communicates with the injection return port of the variable frequency compressor and the fixed frequency compressor through a corresponding electromagnetic valve. During the operation of the air conditioner, the present invention alternately operates the variable frequency compressor and the fixed frequency compressor according to the load demand of the air conditioner, thereby making full use of the characteristics of the variable frequency air conditioner, improving the operating efficiency of the air conditioner, and achieving the purpose of energy saving . In addition, while the variable frequency compressor or the fixed frequency compressor is running, the vapor refrigerant separated in the flash evaporator is controlled to form a gas injection function to increase the enthalpy of the compressor, thereby improving the low-temperature heating capacity.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to an air conditioner and a control method thereof. Background technique [0002] In the existing air-conditioning refrigeration technology, since the operating frequency of the inverter compressor of the inverter air conditioner can be adjusted, the purpose of energy saving can be achieved. However, when the inverter compressor is running at high frequency, its efficiency is much lower than that of the fixed frequency compressor, which is reflected in the energy efficiency of the air conditioner. ) energy efficiency level difference of 2 or more; when the inverter compressor is running at low frequency, the operating efficiency of the compressor is higher than that of the fixed frequency compressor, which is reflected in the energy efficiency of the air conditioner. The energy efficiency level of the air conditioner is also higher than that of the fixed frequency air conditioner (c...

AI Technical Summary

Problems solved by technology

Therefore, when the inverter air conditioner is running at high frequency for a long time, it will not save energy but consume more energy.

In addition, when the inverter air conditioner is heating at low temperature, the amount of air suction of the compressor is reduced, resulting in a decrease in the heating capacity.

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