Method and system for preventing bias flowing of refrigerant in multi-split air conditioner and multi-split air conditioner

Abstract

The invention provides a method and a system for preventing bias flowing of a refrigerant in a multi-split air conditioner and the multi-split air conditioner. The method for preventing the bias flowing of the refrigerant in the multi-split air conditioner comprises the steps of obtaining the superheating degree of each indoor heat exchanger; comparing the obtained superheating degree with the target superheating degree, adjusting the open degree of an expansion valve when the obtained superheating degree is not equal to the target superheating degree, and enabling the superheating degree of each indoor heat exchanger to tend to be equal to the target superheating degree; correcting the target superheating degree if the superheating degree of each indoor heat exchanger is still not equal to the target superheating degree when the maximum time for adjusting the open degree of the expansion valve is up to a preset time, and then adjusting the open degree of the expansion valve according to a comparison result of the superheating degree of each indoor heat exchanger and the corrected target superheating degree. According to the method for preventing the bias flowing of the refrigerant in the multi-split air conditioner, provided by the invention, the engineering installation situation and the actual load of indoor units are comprehensively considered, the open degree of an electronic expansion valve can be intelligently controlled, the bias flowing of the refrigerant is reduced, and the refrigerating effect of the indoor units is balanced.

Description

technical field [0001] The invention relates to the field of refrigeration equipment, and more specifically, relates to a method for preventing refrigerant drift in a multi-connected air conditioner, a system for preventing refrigerant drift in a multi-connected air conditioner, and a multi-connected air conditioner. Background technique [0002] In a one-to-many multi-connected central air conditioner (that is, one outdoor unit is connected to multiple indoor units), how to reduce the bias flow of the refrigerant in the indoor unit in the cooling state and balance the cooling effect of the indoor unit has always been a matter of great concern in the industry. . At present, more and more indoor units adopt superheat control technology, which alleviates the phenomenon of unbalanced cooling effect of indoor units to a certain extent, but the installation of multi-connected central air conditioners in actual projects is more complicated, such as Problems such as long piping, h...

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Problems solved by technology

[0004] However, the above two methods have disadvantages: the above two methods simply control the opening of the electronic expansion valve according to the number of indoor units running or the length of the pipeline, but cannot comprehensively consider the engineering installation conditions and actual load of the indoor unit. Control the opening of the electronic expansion valve to reduce the bias flow of the refrigerant

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