Air conditioning system and control method of air conditioning system

Abstract

The invention provides an air conditioning system and a control method of the air conditioning system. The air conditioning system comprises one or more outdoor units, one or more indoor units, a first valve body and a controller; the one or more indoor units are connected with the one or more outdoor units through a liquid pipe, a low-pressure air pipe and a high-pressure air pipe; the valve body is arranged between the low-pressure air pipe and the high-pressure air pipe; and the controller is used for controlling the opening and closing of the first valve body according to air return pressure after a heating mode of the air conditioning system is started, so as to make adjustment on the air return pressure. According to the air conditioning system, the air return pressure can be increased, a ratio of air exhaust pressure to the air return pressure is reduced, the heating effect of the air conditioning system is improved, liquid compression of the air conditioning system is prevented, and a compressor is protected effectively.

Description

technical field [0001] The invention relates to the technical field of air-conditioning manufacturing, in particular to an air-conditioning system and a control method for the air-conditioning system. Background technique [0002] When the air-conditioning system, such as the multi-connected air-conditioning system, is started at low temperature heating, most of the refrigerant in the system generally accumulates in the low-pressure tank of the outdoor unit and the outdoor heat exchanger in liquid form. The outdoor heat exchanger acts as an evaporator, and the liquid refrigerant Excessive accumulation will affect the fluidity and evaporation effect of the system refrigerant, resulting in too low return air pressure of the compressor and insufficient return air superheat. At the same time, there is a risk of liquid compression in the compressor, which will affect the service life of the air conditioning system and reduce heating effect of the system. [0003] In addition, du...

AI Technical Summary

Problems solved by technology

[0002] When the air-conditioning system, such as the multi-connected air-conditioning system, is started at low temperature heating, most of the refrigerant in the system generally accumulates in the low-pressure tank of the outdoor unit and the outdoor heat exchanger in liquid form. The outdoor heat exchanger acts as an evaporator, and the liquid refrigerant Excessive accumulation will affect the fluidity and evaporation effect of the system refrigerant, resulting in too low return air pressure of the compressor and insufficient return air superheat. At the same time, there is a risk of liquid compression in the compressor, which will affect the service life of the air conditioning system and reduce The heating effect of the system

[0003] In addition, during low-temperature heating operation, if the return air pressure is too low, the exhaust-return air pressure ratio is too high, and the exhaust temperature is too high, the inside of the compressor cannot be effectively cooled, which will easily cause the compressor to burn out due to high temperature.

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