Multi-split air conditioner and controlling method thereof

Abstract

The invention belongs to the technical field of air conditioners, particularly relates to a multi-split air conditioner and a controlling method thereof, and aims at solving the problems of the pipeline complicity of the multi-split air conditioner and potential safety hazards in an existing air conditioner system. The multi-split air conditioner comprises a first outdoor heat exchanging device (matched with a first outdoor unit expansion valve) and a second outdoor heat exchanging device (matched with a second outdoor unit expansion valve) which are parallelly arranged, a first cold medium circulating loop which is composed of a compressor, a four-way valve, the first outdoor heat exchanging device, the first outdoor unit expansion valve and any of indoor unit and a second cold medium circulating loop which is composed of a compressor, a four-way valve, the second indoor heat exchanging device, the second outdoor unit expansion valve and any indoor unit. The first cold medium circulating loop and the second cold medium circulating loop can be switched off / on by the first outdoor unit expansion valve and the second outdoor unit expansion valve. The multi-split air conditioner has the advantages that complicated pipeline designing is avoided, the cold medium leakage risk is greatly reduced, and the production cost is further reduced.

Description

technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a multi-connected air conditioner and a control method thereof. Background technique [0002] Multi-connected air conditioners are usually matched with a larger number of indoor units and a much smaller number of outdoor units (one or more). According to the size and quantity of the room, some of the matched indoor units have a smaller horsepower setting. For example, in a multi-connected system, there is one 26HP outdoor unit, which can match 26 1HP indoor units. At this time, the indoor and outdoor units The matching ratio is 100%. According to the above configuration, the multi-connection unit is fully open, and the multi-connection system can run normally and stably. However, because the outdoor unit is often designed with only one outdoor heat exchanger, if only one indoor unit is turned on, the outdoor heat exchanger corresponding to this indoor unit ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems in the prior art, that is, in order to avoid frequent switching on and off of the compressor, reduce the complexity of the piping of the multi-connected air conditioner, and eliminate the potential safety hazards existing in the existing air conditioner system, the present invention proposes a multi-connected The air conditioner includes a plurality of indoor units and at least one outdoor unit, and the outdoor unit includes at least a first outdoor heat exchanger and a second outdoor heat exchanger arranged in parallel, and a first outdoor heat exchanger matched with the first outdoor heat exchanger The external unit expansion valve and the second external unit expansion valve matched with the second outdoor heat exchanger; the multi-line unit also includes a compressor and a four-way valve, the compressor, the four-way valve, the An outdoor heat exchanger, the expansion valve of the first outdoor unit and any one of the indoor units form a first refrigerant circulation loop; the compressor, the four-way valve, the second outdoor heat exchanger, the second The expansion valve of the outdoor unit and any one of the indoor units form a second refrigerant circulation loop; the first expansion valve of the outdoor unit can close / open the first refrigerant circulation loop, and the second expansion valve of the outdoor unit can close / open the Second refrigerant cycle

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