The method of judging whether the multi-connected indoor heat exchanger has liquid accumulation during heating

Abstract

The invention discloses a method for judging whether liquid is accumulated in indoor heat exchangers of multi-connected units in the heating process. The method is characterized by comprising the steps of sequentially detecting each started indoor unit, judging whether each started indoor unit meets the condition that the inlet temperature Te1 of coils of started indoor units minus the outlet temperature Te2 of the coils of the started indoor units is greater than or equal to 30 DEG C and the condition that the middle temperature Tem of the coils of the started indoor units minus the outlet temperature Te2 of the coils of the started indoor units is greater than or equal to 10 DEG C, judging that the liquid is accumulated in the started indoor units if the two conditions are both met and judging that the liquid is not accumulated in the started indoor units if the two conditions are not both met. The method is fast, convenient and accurate.

Description

technical field [0001] The invention relates to a multi-connected air conditioner unit, in particular to a method for judging whether a multi-connected indoor heat exchanger accumulates liquid during heating. Background technique [0002] The multi-connected air conditioner unit in the prior art is referred to as a multi-connected unit for short, and it includes an outdoor unit, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and outdoor unit. The outdoor unit communicates with multiple indoor units connected in parallel through two refrigerant circulation main pipes. [0003] The outdoor unit includes a compressor, an oil separator, a four-way reversing valve, an outdoor heat exchanger (a condenser for cooling and an evaporator for heating), an electronic expansion valve for the outdoor unit, a liquid receiver and a gas-liquid separator. The outlet of the compressor is connected with the inlet of the...

AI Technical Summary

Problems solved by technology

[0006] Since the multiple indoor units connected in parallel of the unit have different models, heat exchange capacities, fan operating speeds, and heating requirements, etc., in actual operation, it is easy to see that the amount of refrigerant liquid after the indoor units are turned on after heat exchange Excessive conditions, and the liquid receiver of the prior art can store this part of the excess refrigerant; however, with the increasingly fierce competition in the air-conditioning market, manufacturers control the cost to the extent that pennies are a must. In order to reduce the cost, many manufacturers The liquid receiver is directly canceled, so that when there is too much liquid refrigerant in the system, in order to prevent the liquid from hitting the compressor, the opening of the electronic expansion valve of the external unit can only be closed, so that this part of the liquid refrigerant will reversely accumulate along the pipeline , and finally slowly accumulate in the indoor heat exchanger of the indoor unit, that is, the indoor heat exchanger has liquid accumulation. Once this happens, the flow rate of the refrigerant will be slow, the heating effect of the indoor mechanism will become poor, and even a high-pressure failure will be reported at the compressor outlet

The detection methods in the prior art lack a method that can quickly and accurately determine whether the indoor heat exchanger has liquid accumulation

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