Multi-split air conditioner outdoor unit, installation method, and air conditioning system

Abstract

A multi-split air conditioner outdoor unit is disclosed. The multi-split air conditioner comprises: a compressor; an outdoor heat exchanger; an outdoor expansion valve; a four-way valve; a first valve; and a second valve. The four-way valve includes a first port, a second port, a third port, and a fourth port, the first port is connected to a discharge port of the compressor, the second port is connected to the outdoor heat exchanger, the outdoor expansion valve, and the first valve in sequence, and the third port is connected to a suction port of the compressor. The multi-split comprises: a first manifold connected between the discharge port of the compressor and the first port; a third valve disposed in the first manifold; a second manifold connected between the suction port of the compressor and the third port; and a switching device.

What is claimed is: 
     
         1 . A multi-split air conditioner outdoor unit, comprising: a compressor; an outdoor heat exchanger; an outdoor expansion valve; a four-way valve; a first valve; and a second valve, wherein
 the four-way valve includes a first port, a second port, a third port, and a fourth port, the first port is connected to a discharge port of the compressor, the second port is connected to the outdoor heat exchanger, the outdoor expansion valve, and the first valve in sequence, and the third port is connected to a suction port of the compressor,   the four-way valve is capable of being switched to connect the first port to the second port and connect the third port to the fourth port, or switched to connect the first port to the fourth port and connect the second port to the third port,   the multi-split air conditioner outdoor unit further comprises:   a first manifold connected between the discharge port of the compressor and the first port;   a third valve disposed in the first manifold;   a second manifold connected between the suction port of the compressor and the third port; and   a switching device connected to the second manifold, the fourth port, and the second valve, and capable of being switched between a first switching state and a second switching state,   in the first switching state, the switching device connects the fourth port to the second valve, and   in the second switching state, the switching device connects the second manifold to the second valve.   
     
     
         2 . The multi-split air conditioner outdoor unit according to  claim 1 , wherein the switching device includes a fifth valve and a sixth valve, two ends of the fifth valve are respectively connected to the fourth port and the second valve, one end of the sixth valve is connected to the second manifold, and the other end is connected between the fifth valve and the second valve. 
     
     
         3 . The multi-split air conditioner outdoor unit according to  claim 2 , wherein the fifth valve and the sixth valve are both ball valves. 
     
     
         4 . The multi-split air conditioner outdoor unit according to  claim 1 , wherein the switching device is a three-way valve, and three ports of the three-way valve are respectively connected to the second manifold, the fourth port, and the second valve. 
     
     
         5 . The multi-split air conditioner outdoor unit according to  claim 1 , further comprising: a control unit, wherein the control unit is capable of
 switching the switching device to the first switching state when the multi-split air conditioner outdoor unit is applied to a two-pipe air conditioning system, and   switching the switching device to the second switching state when the multi-split air conditioner outdoor unit is applied to a three-pipe air conditioning system.   
     
     
         6 . The multi-split air conditioner outdoor unit according to  claim 1 , wherein the first valve, the second valve, and the third valve are all stop valves. 
     
     
         7 . The multi-split air conditioner outdoor unit according to  claim 1 , further comprising:
 a vapor-liquid separator connected between the third port and the suction port of the compressor; and   an oil separator connected between the first port and the discharge port of the compressor.   
     
     
         8 . An installation method, which is used for installing the multi-split air conditioner outdoor unit according to  claim 1  to form an air conditioning system, the installation method comprising:
 performing connection to a refrigerant pipeline of an indoor unit using pipelines where the first valve and the second valve are located and switching the switching device to the first switching state when the air conditioning system to be installed is a two-pipe air conditioning system; and 
 performing connection to a refrigerant pipeline of an indoor unit using pipelines where the first valve, the second valve, and the third valve are located and switching the switching device to the second switching state when the air conditioning system to be installed is a three-pipe air conditioning system. 
 
     
     
         9 . An air conditioning system, comprising: the multi-split air conditioner outdoor unit according to  claim 1 ; and an indoor unit, wherein
 the air conditioning system is a two-pipe air conditioning system, the multi-split air conditioner outdoor unit is connected to a refrigerant pipeline of the indoor unit using pipelines where the first valve and the second valve are located, and the switching device is switched to the first switching state, or   the air conditioning system is a three-pipe air conditioning system, the multi-split air conditioner outdoor unit is connected to a refrigerant pipeline of the indoor unit using pipelines where the first valve, the second valve, and the third valve are located, and the switching device is switched to the second switching state.   
     
     
         10 . A multi-split air conditioner outdoor unit, comprising: a compressor; an outdoor heat exchanger; an outdoor expansion valve; a four-way valve; a first valve; and a second valve, wherein
 the four-way valve includes a first port, a second port, a third port, and a fourth port,   the first port is connected to a discharge port of the compressor,   the second port is connected to the outdoor heat exchanger, the outdoor expansion valve, and the first valve in sequence,   the third port is connected to a suction port of the compressor,   the fourth port is connected to the second valve,   the four-way valve is capable of being switched to connect the first port to the second port and connect the third port to the fourth port, or switched to connect the first port to the fourth port and connect the second port to the third port, and   the multi-split air conditioner outdoor unit further comprises:   a first manifold connected between the discharge port of the compressor and the first port;   a third valve disposed in the first manifold;   a third manifold connected between the suction port of the compressor and the third port; and   a fourth valve disposed in the third manifold.   
     
     
         11 . The multi-split air conditioner outdoor unit according to  claim 10 , wherein the first valve, the second valve, the third valve, and the fourth valve are all stop valves. 
     
     
         12 . The multi-split air conditioner outdoor unit according to  claim 10 , further comprising:
 a vapor-liquid separator connected between the third port and the suction port of the compressor; and   an oil separator connected between the first port and the discharge port of the compressor.   
     
     
         13 . An installation method, which is used for installing the multi-split air conditioner outdoor unit according to  claim 10  to form an air conditioning system, the installation method comprising:
 performing connection to a refrigerant pipeline of an indoor unit using pipelines where the first valve and the second valve are located when the air conditioning system to be installed is a two-pipe air conditioning system; and 
 performing connection to a refrigerant pipeline of an indoor unit using pipelines where the first valve, the third valve, and the fourth valve are located when the air conditioning system to be installed is a three-pipe air conditioning system. 
 
     
     
         14 . An air conditioning system, comprising: the multi-split air conditioner outdoor unit according to  claim 10 ; and an indoor unit, wherein
 the air conditioning system is a two-pipe air conditioning system, and the multi-split air conditioner outdoor unit is connected to a refrigerant pipeline of the indoor unit using pipelines where the first valve and the second valve are located, or   the air conditioning system is a three-pipe air conditioning system, and the multi-split air conditioner outdoor unit is connected to a refrigerant pipeline of the indoor unit using pipelines where the first valve, the third valve, and the fourth valve are located.