Patent ID: 8931298
Filing Date: 2015-01-13
Classification: F25B

Abstract:
1. An air conditioner comprising: a triple-pipeline first outdoor unit provided with a first compressor, a first outdoor heat exchanger, and a first outdoor expansion valve and connected by a refrigerant discharge pipe, a refrigerant sucking pipe and a first in-unit fluid pipe; a plurality of indoor units provided with a plurality of indoor heat exchangers and connected by an inter-unit pipeline, a first end of the first outdoor heat exchanger selectively branched and connected to the refrigerant discharge pipe and the refrigerant sucking pipe of the first compressor, the inter-unit pipeline including a high-pressure gas pipe connected to the refrigerant discharge pipe, a low-pressure gas pipe connected to the refrigerant sucking pipe, and a fluid pipe connected to the first in-unit fluid pipe at a second end of the first outdoor heat exchanger, a first end of each of the plurality of indoor heat exchangers is selectively branched and connected to the high-pressure gas pipe and the low-pressure gas pipe, and a second end of each of the plurality of indoor heat exchangers is connected to the fluid pipe through a fluid branch pipe so that the plurality of the indoor units can perform a cooling operation or a heating operation at the same time or the cooling operation and the heating operation can be performed in a mixed manner; and a double-pipeline second outdoor unit provided with a second compressor, a second outdoor heat exchanger, and a second outdoor expansion valve and connected by two pipelines of a gas pipe and a fluid pipe, wherein the fluid pipe of the second outdoor unit is connected to the fluid pipe of the inter-unit pipeline, the high-pressure gas pipe is configured to be connected to the refrigerant discharge pipe in cases of the cooling and heating operations, a valve-element kit having a channel switching valve that selectively connects the gas pipe of the double-pipeline second outdoor unit to the high-pressure gas pipe or the low-pressure gas pipe of the inter-unit pipeline is provided, the channel switching valve is a single four-way valve, in which the gas pipe of the double-pipeline second outdoor unit is connected to a first port of the single four-way valve, the low-pressure gas pipe is connected to a second port of the single four-way valve, the high-pressure gas pipe is connected to a third port of the single four-way valve, and the low-pressure gas pipe is connected to a fourth port of the single four-way valve through a capillary tube, and the gas pipe of the double-pipeline second outdoor unit is connected to the high-pressure gas pipe or the low-pressure gas pipe of the inter-unit pipeline only through the single four-way valve.