Multi-split air conditioner capable of refrigerating and heating simultaneously

Abstract

Disclosed is a multi-split air conditioner capable of refrigerating and heating simultaneously. A heating circuit consists of a compressor ( 1 ), an oil-gas separator ( 2 ), a four-way valve ( 3 ), indoor heat exchanging systems ( 12,16,21,22 ), an outdoor heat exchanger ( 7 ), a four-way valve ( 3 ), and a gas-liquid separator ( 26 ) connected in series along the refrigerant flow direction. A refrigerating circuit consist of a compressor ( 1 ), an oil-gas separator ( 2 ), a four-way valve ( 3 ), an outdoor heat exchanger ( 7 ), indoor heat exchanging systems ( 12,16,21,22 ), and a gas-liquid separator ( 26 ) connected in series along the refrigerant flow direction. A parallel pipeline is arranged at a pipeline between the outdoor heat exchanger ( 7 ) and the indoor heat exchanging systems ( 12,16,21,22 ), and is utilized for connecting an second electronic expansion valve ( 8 ) with a second one-way valve ( 9 ) in parallel. A series pipeline is arranged with a third control valve ( 5 ) and a third one-way valve ( 6 ). An end of the series pipeline is connected to the pipeline between the four-way valve ( 3 ) and the outdoor heat exchanger ( 7 ), and another end of the series pipeline is connected to the pipeline between a first one-way valve ( 4 ) and the indoor exchanging systems ( 12,16,21,22 ). Five operation modes, i.e. single refrigerating, single heating, mainly refrigerating, mainly heating, simultaneous refrigerating and heating, can be realized in the multi-split air conditioner capable of refrigerating and heating simultaneously.

1 . A multi-split air conditioner capable of refrigerating and heating simultaneously comprising a compressor, an oil-gas separator, a four-way valve, an outdoor heat exchanger, at least two indoor heat exchanging mechanisms and a gas-liquid separator, wherein:
 the oil-gas separator and the compressor are connected via an oil return pipeline;   each of the indoor heat exchanging mechanisms comprises an indoor heat exchanger and a first electronic expansion valve which are connected in serial;   the indoor heat exchanging mechanisms are connected in parallel to form an indoor heat exchanging system;   a heating loop is formed by connecting the compressor, the oil-gas separator, the four- way valve, the indoor heat exchanging system, the outdoor heat exchanger, the four-way valve and the gas-liquid separator in sequence in a refrigerant flowing direction, and a first control valve is provided on a connecting pipeline between the four-way valve and each of the indoor heat exchangers;   a heating loop is formed by connecting the compressor, the oil-gas separator, the four-way valve, the outdoor heat exchanger, the indoor heat exchanging system and the gas-liquid separator in sequence in a refrigerant flowing direction, and a second control valve is provided on a connecting pipeline between the gas-liquid separator and each of the indoor heat exchangers;   a first one-way valve is provided on a connecting pipeline between the four-way valve and the indoor heat exchanging system;   a parallel pipeline is provided between the outdoor heat exchanger and the indoor heat exchanging system, and the parallel pipeline is formed by connecting a second electronic expansion valve and a second one-way valve in parallel; and   in addition to the parallel pipeline, a serial pipeline is further comprised and is provided with a third control valve and a third one-way valve, and the serial pipeline comprises one end connected to a pipeline between the four-way valve and the outdoor heat exchanger, and the other end connected to a pipeline between the first one-way valve and the indoor heat exchanging system.   
     
     
         2 . The multi-split air conditioner capable of refrigerating and heating simultaneously according to  claim 1 , wherein the first control valve, the second control valve and the third control valve each are an electromagnetic valve. 
     
     
         3 . The multi-split air conditioner capable of refrigerating and heating simultaneously according to  claim 1 , wherein the compressor is an inverter compressor.