Refrigerating unit and control method thereof

Abstract

The invention provides a refrigerating unit and a control method thereof. The refrigerating unit comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger and a first throttling device, wherein the first throttling device is arranged between the indoor heat exchanger and the outdoor heat exchanger; the refrigerating unit further comprises a first branch; one end of the first branch communicates with a pipeline between the outdoor heat exchanger and the compressor, and the other end of the first branch communicates with a pipeline between the outdoor heat exchanger and the first throttling device; and the first branch can guide a refrigerant at the outlet end of the outdoor heat exchanger back to the inlet end of the outdoor heat exchanger when the indoor heat exchanger isdefrosted. According to the refrigerating unit and the control method thereof, the flow of the refrigerant entering an air suction port of the compressor can be reduced when the indoor heat exchangeris used for heating and defrosting, the air suction pressure of the compressor is reduced, the exhaust high-pressure of the compressor is reduced, the situation that the high pressure of the refrigerating unit is high in the defrosting period, and consequently unit defrosting is finished in advance is avoided, and the defrosting process is effectively and continuously carried out.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a refrigeration unit and a control method thereof. Background technique [0002] During the defrosting of the existing refrigeration defrosting unit, the evaporator of the unit acts as a condenser, and its frost layer absorbs the heat of the high-temperature refrigerant and melts. , so that the suction port of the compressor of the unit is easy to be filled with liquid, and at the same time, the high pressure of the unit will gradually rise during the defrosting period under some severe working conditions, reaching the protection value, so that the defrosting of the unit ends early. [0003] Due to the fact that the refrigeration unit in the prior art will have a high pressure during the defrosting period and reach the protection value, the defrosting of the unit will end early, which will seriously affect the defrosting process; Due to the low degree of superheat, the suc...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the high pressure of the refrigerating unit in the prior art will reach the protection value during the defrosting period, which will lead to the premature end of the defrosting of the refrigerating unit, thereby providing a refrigerating unit and its control method

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