Electronic expansion valve control method and device in multi-line refrigeration operation

Abstract

The invention discloses a method for controlling an electronic expansion valve in multi-line refrigeration operation, comprising: obtaining the current temperature difference of each indoor unit currently in the power-on state and the preset initial superheat degree of the outdoor unit, and according to the current temperature difference and the set The initial superheat degree calculation corresponds to the target superheat degree of the indoor unit; wherein, the current temperature difference is the difference between the return air temperature of the current indoor unit and the preset reference temperature; The difference between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger determines the current degree of superheat; wherein, the indoor unit corresponds to the heat exchanger one by one; adjust the corresponding The opening degree of the electronic expansion valve of the indoor unit. The invention also discloses an electronic expansion valve control device in multi-line cooling operation. By adopting the embodiment of the present invention, the cooling efficiency of the unit can be effectively improved, the distribution of refrigerant in the system can be balanced, and the reliability of the whole machine can be improved.

Description

technical field [0001] The invention relates to the technical field of multi-connection control, in particular to a method and device for controlling an electronic expansion valve in multi-connection cooling operation. Background technique [0002] The multi-split unit is a relatively complex circulation system composed of one or more outdoor units equipped with several indoor units. When there are many indoor units, the installation conditions, environment and usage characteristics of each indoor unit are different. During cooling operation, the same target superheat is usually used to control the opening of the electronic expansion valves of all indoor units. If the indoor units are started to control the opening of the electronic expansion valves of multiple indoor units according to the same target value, it will cause Individual indoor units cannot efficiently exert their cooling performance, and in severe cases, the refrigerant distribution in the system will be uneve...

AI Technical Summary

Problems solved by technology

During cooling operation, the same target superheat is usually used to control the opening of the electronic expansion valves of all indoor units. If the indoor units are started to control the opening of the electronic expansion valves of multiple indoor units according to the same target value, it will cause Some indoor units cannot efficiently exert their cooling performance, and in severe cases, the distribution of refrigerant in the system will be uneven, and the efficiency of the whole unit will decrease

Images