Ultralow-temperature refrigeration type single-cooling split air conditioner and ultralow-temperature refrigeration method thereof

Abstract

The invention discloses an ultralow-temperature refrigeration type single-cooling split air conditioner and an ultralow-temperature refrigeration method thereof. The single-cooling split air conditioner comprises an evaporator, a compressor, a condenser, a first bypass electronic expansion valve, a pressure-splitting capillary tube and a liquid storage tank, wherein the compressor, the condenser and the evaporator form refrigerant circulation, the liquid storage tank is connected between the condenser and the evaporator in series, the capillary tube is connected between the liquid storage tank and the condenser in series, and the first electronic expansion valve is connected to the capillary tube and the condenser both connected in series in parallel. According to the air conditioner, the system circulation pressure on the condensation side is maintained by lowering the heat exchange strength in a condenser tube in a continuous adjustable mode, and therefore normal refrigerant circulation of a refrigerating system can be maintained, and refrigeration can still be normally carried out on the condition of ultralow outdoor environment temperature. The invention further discloses the ultralow-temperature refrigeration method of the single-cooling split air conditioner.

Description

technical field [0001] The invention relates to an air conditioner, in particular to an ultra-low temperature refrigeration single-cooling split air conditioner and an ultra-low temperature refrigeration method thereof. Background technique [0002] In some usage scenarios, regardless of the outdoor temperature (50°C high or -40°C low), the indoor environment needs to be refrigerated. [0003] At present, there are mainly two processing schemes for low-temperature refrigeration in the market. [0004] 1. Maintain the system circulation pressure on the condensing side by reducing the heat transfer intensity outside the condenser tube, so as to maintain the normal refrigerant circulation of the refrigeration system, and achieve normal refrigeration under the ultra-low outdoor ambient temperature. That is: reduce the intensity of outdoor heat exchange by reducing the speed of the outdoor fan. [0005] However, there are defects in this solution: 1. Due to the characteristics ...

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Problems solved by technology

[0005] However, there are defects in this solution: 1. Due to the characteristics of the motor, the speed of the outdoor fan cannot be reduced without limit; 2. When the speed of the outdoor fan is low, the wind pressure of the fan is small, and the heat exchange on the condensation side in different wind directions outdoors There is a large difference in strength; 3. When the outdoor fan is 0, there is a safety risk of high pressure and overpressure; 4. The minimum outdoor ambient temperature of this scheme is generally -15~-5℃

[0007] However, there are defects in this scheme: 1. Since the heat exchange intensity in the condenser tube is adjusted by the electromagnetic valve switch to maintain the system circulation pressure on the condensation side, there are pressure fluctuations in the refrigeration system, and the load of the compressor and the cooling capacity obtained in the room also fluctuate accordingly ; 2. This scheme is mainly used in refrigeration and refrigeration systems; 3. This scheme is suitable for the refrigeration system of fixed-speed machines, and there is a defect that the flow rate of the variable frequency compressor is too large

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