Anti-freezing control method and anti-freezing control device of cold and hot water unit, and cold and hot water unit

Abstract

The invention provides an anti-freezing control method and an anti-freezing control device of a cold and hot water unit, and the cold and hot water unit. The anti-freezing control method of the cold and hot water unit comprises the steps of detecting the refrigerant inlet temperature T1 of an evaporator; detecting the air suction temperature T2 of a compressor; detecting the pressure P of any one of an air suction inlet of the compressor, a refrigerant inlet of the evaporator and a refrigerant outlet of the evaporator; judging that the evaporator is in a freezing risk if T1 is continuously smaller than 0 DEG C in a second preset time and T2 is smaller than 0 DEG C or the pressure P is smaller than a preset pressure P1 after the cold and hot water unit is started to work in a refrigeration mode for a first preset time. According to the anti-freezing control method, the anti-freezing control device and the cold and hot water unit, provided by the invention, whether the evaporator is in the freezing risk or not can be jointly judged by detecting the refrigerant inlet temperature of the evaporator, the air suction temperature of the compressor and the refrigerant pressure P, and thus the problem that a heat exchanger is possible to be frozen while the cold and hot water unit works in the refrigeration mode can be avoided; meanwhile, error protection of the cold and hot water unit can be avoided, the reliability is increased, and the running safety and the running stability of the cold and hot water unit can be ensured.

Description

technical field [0001] The invention relates to the field of cold and hot water units, in particular to an antifreeze control method for a cold and hot water unit, an antifreeze control device and a cold and hot water unit. Background technique [0002] The cold and hot water unit transfers the cold / heat to the circulating water through the water-fluorine heat exchanger, and then sends it to the user side through the water pump to realize the cooling / heating function. During the operation of the unit, if it is used improperly, it will easily cause the circulating water in the heat exchanger on the evaporating side to freeze in a short period of time, resulting in the outer shell of the heat exchanger or the internal heat exchange pipeline freezing and cracking, resulting in system damage or even water in the fluorine system. Further cause damage to other components such as the compressor, which has a great impact. The current technology mostly judges whether there is a risk...

AI Technical Summary

Problems solved by technology

During the operation of the unit, if it is used improperly, it will easily cause the circulating water in the heat exchanger on the evaporating side to freeze in a short period of time, causing the outer shell of the heat exchanger or the internal heat exchange pipeline to freeze and crack, resulting in damage to the system or even damage to the fluorine system. Further cause damage to other components such as the compressor, which has a great impact

The current technology mostly judges whether there is a risk of freezing on the water side of the heat exchanger by detecting the water inlet and outlet pipes and refrigerant pipes of the heat exchanger, but it cannot guarantee accurate judgment and there is a problem of misjudgment that affects the use of users

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