Air conditioning system and control method

Abstract

The invention relates to the field of air conditioning, and aims to solve the problem that a four-way reversing valve of an existing air conditioning system is expensive, has a high failure rate and the like. The air conditioning system of the invention comprises a four-way valve, a compressor, a liquid pipe, a low-pressure air pipe, a high-pressure air pipe, an air suction pipeline, at least twoindoor units and a bypass flow pipeline, wherein the four-way valve has first to fourth ports; an exhaust port of the compressor communicates with the first port; the liquid pipe communicates the second port, the liquid pipe is provided with an expansion valve, and a heat exchanger is arranged between the expansion valve and the second port; the low-pressure air pipe communicates with the third port; the high-pressure air pipe communicates with the fourth port and is provided with a first electronic control valve; the air suction pipeline communicates with an air suction port of the compressorand the low-pressure air pipe; the at least two indoor units are equipped with mode switching devices correspondingly, and the liquid pipe, the high-pressure air pipe and the low-pressure air pipe communicate with all the mode switching devices; and one end of the bypass flow pipeline provided with a second electric control valve is connected between the exhaust port and the first port, and the other end of the bypass flow pipeline is connected between the first electronic control valve and the mode switching devices. The cost of the air conditioning system is lower, and meanwhile, the failure rate can also be reduced by reducing the number of the four-way valves.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system and a control method. Background technique [0002] The central air-conditioning system is composed of one or more cold and heat source systems and multiple air-conditioning systems. This system is different from traditional household air conditioners, and can centrally process air to meet comfort requirements. The principle of refrigerant phase change refrigeration is used to provide the required cooling capacity for the air-conditioning system to offset the cooling load of the indoor environment; the heating system provides the required heat for the air-conditioning system to offset the heat load of the indoor environment. [0003] At present, the central air-conditioning system uses the combination of two or more four-way reversing valves to switch the outdoor unit to provide high-temperature refrigerant and low-temperature refrigerant to th...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the existing problems of the four-way reversing valve in the existing air-conditioning system, such as high price, high failure rate, and high maintenance cost, the present invention provides an air-conditioning system, which includes : four-way valve, the four-way valve has first to fourth interfaces, the four-way valve has a first state and a second state, when the four-way valve is in the first state, the first interface communicate with the second port, the third port communicates with the fourth port; when the four-way valve is in the second state, the first port communicates with the fourth port, and the first port communicates with the fourth port. The second interface is communicated with the third interface; the compressor, the exhaust port of the compressor is communicated with the first interface; the liquid pipe is communicated with the second interface, and the liquid pipe is provided with an expansion valve, A heat exchanger is provided between the expansion valve and the second interface; a low-pressure air pipe communicates with the third interface; a high-pressure air pipe communicates with the fourth interface, and the high-pressure air pipe is provided with a first electrical A control valve; a suction pipeline, communicated with the suction port of the compressor and the low-pressure air pipe; at least two indoor units, each of which is equipped with a mode conversion device, the liquid pipe, the The high-pressure air pipe and the low-pressure air pipe communicate with each of the mode conversion devices; a bypass pipeline, one end of the bypass pipeline is connected between the exhaust port and the first interface, and the bypass pipeline The other end of the pipeline is connected between the first electric control valve and the mode conversion device, and a second electric control valve is provided on the bypass pipeline

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