Air conditioning system

Abstract

The present invention provides an air conditioning system comprising: a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger, a reservoir, a first solenoid valve, a second solenoid valve, and a check valve connected through pipelines, wherein the four-way valve has a first port for communicating with an exhaust port of the compressor, a second port for communicating with a first end of the first heat exchanger, a third port for communicating with a first end of the second heat exchanger, and a fourth port for communicating with a second end of the third heat exchanger; wherein a second end of the first heat exchanger is connected to a first end of the reservoir, and the second end of the first heat exchanger is connected to the first end of the reservoir.

What is claimed is: 
     
         1 . An air conditioning system, comprising:
 a compressor, a four-way valve, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first throttling element and a second throttling element with a shut-off function, a reservoir, a first solenoid valve, a second solenoid valve, and a check valve connected through pipelines,   wherein the four-way valve has a first port for communicating with an exhaust port of the compressor, a second port for communicating with a first end of the first heat exchanger, a third port for communicating with a first end of the second heat exchanger, and a fourth port for communicating with a second end of the third heat exchanger;   wherein a second end of the first heat exchanger is connected to a first end of the reservoir through the second solenoid valve, and at the same time the second end of the first heat exchanger is connected to the first end of the reservoir through the check valve; a second end of the second heat exchanger is connected to a second end of the reservoir through the second throttling element; a first end of the third heat exchanger is connected to the first end of the reservoir through the first solenoid valve, and at the same time the first end of the third heat exchanger is connected to the second end of the reservoir through the first throttling element, and the second end of the third heat exchanger is connected to a suction port of the compressor.   
     
     
         2 . The air conditioning system according to  claim 1 , wherein the air conditioning system further comprises an economizer assembly provided between the second throttling element and the second end of the reservoir, and comprising an intermediate heat exchanger and a throttling bypass for throttling at least a portion of refrigerant, where the throttling bypass is provided with a throttling device, and the intermediate heat exchanger is communicated to an air replenishment port of the compressor. 
     
     
         3 . The air conditioning system according to  claim 2 , where the air conditioning system further comprises a controller that communicates with the first solenoid valve, the second solenoid valve, the first throttling element, the second throttling element, or any combination thereof. 
     
     
         4 . The air conditioning system according to  claim 3 , wherein the air conditioning system has a cooling mode, wherein the controller instructs to turn on the first solenoid valve, the second throttling element, and a first port and a third port of the four-way valve, and to turn off the first throttling element, the second solenoid valve, and a second port and a fourth port of the four-way valve, so that the second throttling element plays a throttling role, thereby allowing the refrigerant of the air conditioning system to sequentially flow through the exhaust port of the compressor, the first port of the four-way valve, the third port of the four-way valve, the second heat exchanger, the second throttling element, the economizer assembly, the reservoir, the first solenoid valve, the third heat exchanger, and the suction port of the compressor. 
     
     
         5 . The air conditioning system according to  claim 3 , wherein the air conditioning system has a heating mode, wherein the controller instructs to turn on the second throttling element and instructs to communicate the first port of the four-way valve with the second port of the four-way valve and to communicate the third port of the four-way valve with the fourth port of the four-way valve, and to turn off the first throttling element, the first solenoid valve, and the second solenoid valve, so that the second throttling element plays a throttling role, thereby allowing the refrigerant of the air conditioning system to sequentially flow through the exhaust port of the compressor, the first port of the four-way valve, the second port of the four-way valve, the first heat exchanger, the check valve, the reservoir, the economizer assembly, the second throttling element, the second heat exchanger, the third port of the four-way valve, the fourth port of the four-way valve, and the suction port of the compressor. 
     
     
         6 . The air conditioning system according to  claim 3 , wherein the air conditioning system has a defrosting mode, wherein the controller instructs to turn on the second throttling element and the second solenoid valve, and instructs to communicate the first port of the four-way valve with the third port of the four-way valve and to communicate the second port of the four-way valve with the fourth port of the four-way valve, and to turn off the first throttling element and the first solenoid valve, so that the second throttling element plays a throttling role, thereby allowing the refrigerant of the air conditioning system to sequentially flow through the exhaust port of the compressor, the first port of the four-way valve, the third port of the four-way valve, the second heat exchanger, the second throttling element, the economizer assembly, the reservoir, the second solenoid valve, the first heat exchanger, the second port of the four-way valve, the fourth port of the four-way valve, and the suction port of the compressor. 
     
     
         7 . The air conditioning system according to  claim 3 , wherein the air conditioning system has a cooling and heat recovery mode, wherein the controller instructs to turn on the first throttling element, the first port and the second port of the four-way valve, and to turn off the second throttling element, the first solenoid valve, the second solenoid valve, the third port and the fourth port of the four-way valve, so that the first throttling element plays a throttling role, thereby allowing the refrigerant of the air conditioning system to sequentially flow through the exhaust port of the compressor, the first port of the four-way valve, the second port of the four-way valve, the first heat exchanger, the check valve, the reservoir, the first throttling element, the third heat exchanger, and the suction port of compressor. 
     
     
         8 . The air conditioning system according to  claim 2 , wherein the compressor is an Enhanced Vapor Injection compressor. 
     
     
         9 . The air conditioning system according to  claim 2 , wherein the air conditioning system further comprises a gas-liquid separator provided between the suction port of the compressor and the second end of the third heat exchanger. 
     
     
         10 . The air conditioning system according to  claim 2 , wherein the second heat exchanger is a fan coil heat exchanger.