Control method of multi-split system

Abstract

The invention discloses a control method of a multi-split system. The method includes the following steps that S1, the indoor environment temperature T1 and the corresponding user set temperature Ts of each indoor unit are detected; S2, the difference value delta T between the indoor environment temperature T1 and the user set temperature Ts of each indoor unit is calculated; S3, the difference value delta T of each indoor unit is compared with the reference value, meanwhile the operation mode of each indoor unit is detected, and the opening of a corresponding flow rate regulating device is adjusted according to the comparison result in the corresponding operation mode. The control method of the multi-split system can meet different refrigerant amount requirements caused by different indoor environment temperatures T1 and user set temperatures Ts of different indoor units, meanwhile the indoor environment temperatures T1 and the user set temperatures Ts are directly used as calculation factors to calculate the opening of the flow rate regulation device, and it is guaranteed that refrigerant is distributed more accurately and reasonably.

Description

technical field [0001] The invention relates to the field of refrigeration, in particular to a control method for a multi-connected system. Background technique [0002] In the multi-connected system in the related art, the distribution of refrigerant among the internal units is controlled by the electronic expansion valve of the internal unit, and the opening of the electronic expansion valve between different internal units is adjusted by the control unit in comparison with the evaporator tube temperature of each internal unit. In terms of process, the opening of the electronic expansion valve of the internal unit with high tube temperature is opened to make more refrigerant flow through the evaporator to increase the evaporation capacity, and the opening of the electronic expansion valve of the internal unit with low tube temperature is reduced to reduce evaporation quantity. The ultimate goal of adjustment is to make the tube temperature of each internal unit evaporator...

AI Technical Summary

Problems solved by technology

[0003] However, there are two problems in the adjustment method of the related technology: one problem is that when there are multiple indoor units working at the same time, when the set temperature of a certain user's room differs greatly from the actual temperature, it is not enough to provide enough refrigerant to make the room The temperature reaches the set temperature quickly, even if the outdoor unit compressor runs at a high frequency to provide more refrigerant circulation, the excess refrigerant circulation is not fully supplied to the indoor unit

[0004] Another problem is that if the set temperature of a certain user's room is close to the actual temperature of the room, the adjustment method in the related technology will make the room temperature quickly reach the set temperature, the electronic expansion valve will be closed, and the refrigerant will no longer flow through the internal unit. ; After the room temperature rises, the electronic expansion valve opens, and the room temperature drops rapidly again, which causes the temperature fluctuation of the user's room to be large; dehumidification

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