Air-conditioning system and control method of the air-conditioning system

Abstract

The present invention proposes an air-conditioning system and a control method for the air-conditioning system, wherein the air-conditioning system includes: one or more outdoor units; one or more indoor units; The high-pressure air pipe is connected to the one or more outdoor units; the first valve body is arranged between the low-pressure air pipe and the high-pressure air pipe; the controller is used for heating in the air-conditioning system After starting, the opening and closing of the first valve body is controlled according to the return air pressure, so as to adjust the return air pressure. The air-conditioning system of the present invention can increase the return air pressure, reduce the discharge-return air pressure ratio, improve the heating effect of the air-conditioning system, prevent liquid compression in the system, and effectively protect the compressor.

Description

Technical field [0001] The present invention relates to the field of air conditioning manufacturing technology, in particular to an air conditioning system and a control method of the air conditioning system. Background technique [0002] Air-conditioning systems, such as multi-line air-conditioning systems, when low-temperature heating starts, most of the refrigerant in the system is generally stored in liquid form in the low-pressure tank of the outdoor unit and the outdoor heat exchanger. The outdoor heat exchanger serves as the 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 and insufficient return air overheating of the compressor. At the same time, the compressor has the risk of liquid compression, which affects the service life of the air-conditioning system and reduces The heating effect of the system. [0003] In addition, during the low-tempera...

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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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