VFRVV VRF air conditioning system refrigerant diversion control method and device

Abstract

A VRF air conditioning system refrigerant diversion control method and device are provided; the method comprises the following steps: when the VRF air conditioning system enters a main heating mode, a second electron expansion valve is controlled to be closed; an electron expansion valve corresponding to a refrigeration inner machine is controlled to do opening degree adjustment; when the opening degree of the electron expansion valve corresponding to the refrigeration inner machine reaches the maximum level, a target opening degree of a second electron expansion valve is calculated according to the total opening degree and the maximum opening degree of the electron expansion valve corresponding to the refrigeration inner machine; the second electron expansion valve is controlled according to the target opening degree. The VRF air conditioning system refrigerant diversion control method can ensure refrigeration effect of the refrigeration inner machine in the main heating mode, can prevent compressor liquid impact, thus ensuring the compressor to work under safety and reliability.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method and device for controlling refrigerant split flow in a multi-connected system. Background technique [0002] When the two-pipe heat recovery multi-connected system operates in the main heating mode, part of the refrigerant recooled by the heat exchanger enters the low-pressure pipe of the outdoor unit through the electronic expansion valve and the heat exchanger, and the other part enters through another electronic expansion valve. After the cooling indoor unit absorbs heat, it finally enters the low-pressure pipe of the outdoor unit. [0003] The opening degree of the electronic expansion valve will affect the refrigerant flow rate entering the refrigeration inner unit and the degree of superheat of the exhaust gas. When the refrigerant flow into the refrigeration inner unit decreases due to improper opening of the electronic expansion valve, the cooling effec...

AI Technical Summary

Problems solved by technology

When the refrigerant flow into the refrigeration inner unit decreases due to improper opening of the electronic expansion valve, the cooling effect of the refrigeration inner unit will be affected; when the exhaust superheat degree is reduced due to the improper opening of the electronic expansion valve, Can cause compressor liquid slugging, causing damage to the compressor

Images