Air conditioning system

Abstract

An air conditioning system is disclosed, having a defrosting mode, a cooling mode, and a heating mode. The defrosting mode includes a first defrosting mode and a second defrosting mode. The air conditioning system comprises: a compressor, an indoor heat exchanger, an outdoor unit, an outdoor heat exchanger assembly, a partition plate, a first fan, a second fan, and defrost pipeline. The compressor includes a suction port and a discharge port. A first end of the indoor heat exchanger is communicated with one of the suction port and the discharge port. The outdoor heat exchanger assembly includes a first part and a second part. The defrost pipeline is communicated with the discharge port.

What is claimed is: 
     
         1 . An air conditioning system, having a defrosting mode, a cooling mode, and a heating mode, the air conditioning system comprising:
 a compressor, comprising a suction port and a discharge port;   an indoor heat exchanger, a first end of the indoor heat exchanger being communicated with one of the suction port and the discharge port;   an outdoor unit, comprising: a housing, wherein a cavity is defined within the housing;   an outdoor heat exchanger assembly, comprising a first part and a second part;   a partition plate, disposed within the cavity and partitioning the cavity into a first space and a second space independent of each other;   a first fan, located in the first space with the first part, the first fan being configured to increase an airflow velocity near the first part;   a second fan, located in the second space with the second part, the second fan being configured to increase an airflow velocity near the second part; and   a defrost pipeline, communicated with the discharge port;   wherein, the defrosting mode comprises a first defrosting mode and a second defrosting mode;   in a case where the air conditioning system operates in the first defrosting mode, the defrost pipeline is configured to transmit a refrigerant discharged from the discharge port to one of the first part and the second part;   in a case where the air conditioning system operates in the second defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to the other of the first part and the second part;   wherein, in a case where the air conditioning system operates in the first defrosting mode to defrost the first part, the first fan stops operating, and the second fan operates normally, so that high-temperature and high-pressure gaseous refrigerant discharged from the discharge port is transmitted to the first part, and a refrigerant cycle is performed between the second part and the indoor heat exchanger to heat indoor air;   in a case where the air conditioning system operates in the second defrosting mode to defrost the second part, the second fan stops operating, and the first fan operates normally, so that the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port is transmitted to the second part for condensation and heat release, the condensed refrigerant is then transmitted to the first part for evaporation and heat absorption, and then returns to the compressor, and the refrigerant cycle is performed between the first part and the indoor heat exchanger to heat indoor air.   
     
     
         2 . The air conditioning system according to  claim 1 , wherein the first part is located on one side of the second part, and in a plane perpendicular to a direction from the first part towards the second part, a projection of at least a portion of the first part overlaps a projection of at least a portion of the second part. 
     
     
         3 . The air conditioning system according to  claim 1 , wherein the first part and the second part are independent heat exchangers respectively. 
     
     
         4 . The air conditioning system according to  claim 1 , wherein a second end of the first part is communicated with a second end of the second part, and the defrost pipeline is communicated with a pipeline between the first part and the second part;
 a first end of the one of the first part and the second part is communicated with the other of the suction port and the discharge port, and a first end of the other of the first part and the second part is communicated with a second end of the indoor heat exchanger and is communicated with the defrost pipeline;   in a case where the air conditioning system operates in the first defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to the first end of the one of the first part and the second part, and discharge the refrigerant from the second end of the one of the first part and the second part;   in a case where the air conditioning system operates in the second defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to the second end of the other of the first part and the second part, and discharge the refrigerant from the first end of the other of the first part and the second part.   
     
     
         5 . The air conditioning system according to  claim 4 , wherein the defrost pipeline comprises:
 a bypass branch, a first end of the bypass branch being communicated with the discharge port; and,   a diverting branch, comprising:
 a first defrost branch, a first end of the first defrost branch being communicated with a second end of the bypass branch, a second end of the first defrost branch is communicated with the pipeline between the first part and the second part; and 
 a second defrost branch, a first end of the second defrost branch being communicated with the second end of the bypass branch, a second end of the second defrost branch is communicated with the first end of the other of the first part and the second part. 
   
     
     
         6 . The air conditioning system according to  claim 5 , wherein the defrost pipeline further comprises:
 a first throttle valve, connected in series with the first defrost branch; and,   a second throttle valve, connected in series with the second defrost branch;   in a case where the air conditioning system operates in the defrosting mode, one of the first throttle valve and the second throttle valve is open, and the other of the first throttle valve and the second throttle valve is closed, to enable one of the first defrost branch and the second defrost branch and block the other of the first defrost branch and the second defrost branch.   
     
     
         7 . The air conditioning system according to  claim 6 , wherein the defrost pipeline further comprises a check valve, the check valve being connected in series with a pipeline between the first throttle valve and the second end of the first defrost branch, wherein a flow direction of the check valve is a direction from the first throttle valve towards the second end of the first defrost branch, and the check valve is configured to control the refrigerant to flow from the first throttle valve to the second end of the first defrost branch and block the refrigerant from flowing from the second end of the first defrost branch to the first throttle valve. 
     
     
         8 . The air conditioning system according to  claim 1 , further comprising a first reversing valve, a first valve port of the first reversing valve being communicated with the discharge port, a fourth valve port of the first reversing valve being communicated with the suction port;
 wherein the first end of the indoor heat exchanger is communicated with a second valve port of the first reversing valve to communicate with the one of the suction port and the discharge port;   wherein a first end of the one of the first part and the second part is communicated with a third valve port of the first reversing valve to communicate with the other of the suction port and the discharge port.   
     
     
         9 . The air conditioning system according to  claim 1 , wherein in a case where the air conditioning system operates in the first defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to a first end of the first part and discharge the refrigerant from a second end of the first part; the second fan operates normally, the first end of the first part is communicated with a second end of the indoor heat exchanger, a first end of the second part is communicated with the suction port, the second end of the first part is communicated with a second end of the second part, the first end of the indoor heat exchanger is communicated with the discharge port, to enable the indoor heat exchanger to heat indoor air;
 wherein in a case where the air conditioning system operates in the second defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to the second end of the second part and discharge the refrigerant from the first end of the second part; the first end of the first part is communicated with the second end of the indoor heat exchanger, the first end of the second part is communicated with the suction port, the second end of the first part is communicated with the second end of the second part, the first end of the indoor heat exchanger is communicated with the discharge port, to enable the indoor heat exchanger to heat indoor air. 
 
     
     
         10 . The air conditioning system according to  claim 1 , wherein in a case where the air conditioning system operates in the first defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to a second end of the first part and discharge the refrigerant from a first end of the first part; a first end of the second part is communicated with a second end of the indoor heat exchanger, the first end of the first part is communicated with the suction port, the first end of the indoor heat exchanger is communicated with the discharge port, to enable the indoor heat exchanger to heat indoor air;
 wherein in a case where the air conditioning system operates in the second defrosting mode, the defrost pipeline is configured to transmit the refrigerant discharged from the discharge port to the first end of the second part and discharge the refrigerant from a second end of the second part;   the first end of the second part is communicated with the second end of the indoor heat exchanger, the first end of the first part is communicated with the suction port, the first end of the indoor heat exchanger is communicated with the discharge port, to enable the indoor heat exchanger to heat indoor air.   
     
     
         11 . The air conditioning system according to  claim 1 , wherein,
 in a case where the air conditioning system operates in the first defrosting mode, a second end of the first part is communicated with the discharge port, a first end of the first part is communicated with the suction port, to enable refrigerant in the compressor to enter the first part from the discharge port and defrost the first part, and then return to the compressor via the suction port; a second end of the second part is communicated with a second end of the indoor heat exchanger, a first end of the second part is communicated with the suction port, the first end of the indoor heat exchanger is communicated with the discharge port, to enable the indoor heat exchanger to heat indoor air;   in a case where the air conditioning system operates in the second defrosting mode, the second end of the second part is communicated with the discharge port, the first end of the second part is communicated with the suction port, to enable the refrigerant in the compressor to enter the second part from the discharge port and defrost the second part, and then return to the compressor via the suction port; the second end of the first part is communicated with the second end of the indoor heat exchanger, the first end of the first part is communicated with the suction port, the first end of the indoor heat exchanger is communicated with the discharge port, to enable the indoor heat exchanger to heat indoor air.   
     
     
         12 . The air conditioning system according to  claim 11 , further comprising:
 a fourth throttle valve, connected in a pipeline between the second end of the first part and the second end of the indoor heat exchanger;   a fifth throttle valve, connected in a pipeline between the second end of the second part and the second end of the indoor heat exchanger;   a first reversing valve, a first valve port of the first reversing valve being communicated with the discharge port, a second valve port of the first reversing valve being communicated with the first end of the indoor heat exchanger, a third valve port of the first reversing valve being communicated with the first end of the first part, a fourth valve port of the first reversing valve being communicated with the suction port;   the defrost pipeline comprises:   a first branch, a first end of the first branch being communicated with the third valve port of the first reversing valve, a second end of the first branch being communicated with the first end of the second part;   a first on-off valve, connected in series with the first branch;   a second branch, a first end of the second branch being communicated with the discharge port, a second end of the second branch being communicated with the first end of the second part;   a sixth throttle valve, connected in series with the second branch;   a third branch, a first end of the third branch being communicated with the discharge port, a second end of the third branch being communicated with a pipeline between the fourth throttle valve and the second end of the first part;   a second on-off valve, connected in series with the third branch;   a fourth branch, a first end of the fourth branch being communicated with the pipeline between the fourth throttle valve and the second end of the first part, a second end of the fourth branch being communicated with a pipeline between the fifth throttle valve and the second end of the second part;   a seventh throttle valve, connected in series with the fourth branch.   
     
     
         13 . The air conditioning system according to  claim 11 , further comprising:
 a fourth throttle valve, connected in a pipeline between the second end of the first part and the second end of the indoor heat exchanger;   a fifth throttle valve, connected in a pipeline between the second end of the second part and the second end of the indoor heat exchanger;   a first reversing valve, a first valve port of the first reversing valve being communicated with the discharge port, a second valve port of the first reversing valve being communicated with the first end of the indoor heat exchanger, a third valve port of the first reversing valve being communicated with the first end of the first part, a fourth valve port of the first reversing valve being communicated with the suction port;   a second reversing valve, a first port of the second reversing valve being communicated with the discharge port, a second port of the second reversing valve being communicated with the suction port, a third port of the second reversing valve being communicated with the first end of the second part;   the defrost pipeline comprises:
 a third branch, a first end of the third branch being communicated with the discharge port, a second end of the third branch being communicated with a pipeline between the fourth throttle valve and the second end of the first part; 
 a second on-off valve, connected in series with the third branch; 
 a fourth branch, a first end of the fourth branch being communicated with the pipeline between the fourth throttle valve and the second end of the first part, a second end of the fourth branch being communicated with a pipeline between the fifth throttle valve and the second end of the second part; and 
 a seventh throttle valve, connected in series with the fourth branch. 
   
     
     
         14 . The air conditioning system according to  claim 11 , further comprising:
 a fourth throttle valve, connected in a pipeline between the second end of the first part and the second end of the indoor heat exchanger;   a fifth throttle valve, connected in a pipeline between the second end of the second part and the second end of the indoor heat exchanger;   a first reversing valve, a first valve port of the first reversing valve being communicated with the discharge port, a second valve port of the first reversing valve being communicated with the first end of the indoor heat exchanger, a third valve port of the first reversing valve being communicated with the first end of the first part, a fourth valve port of the first reversing valve being communicated with the suction port;   the defrost pipeline comprises:
 a first branch, a first end of the first branch being communicated with the third valve port of the first reversing valve, a second end of the first branch being communicated with the first end of the second part; 
 a first on-off valve, connected in series with the first branch; 
 a third branch, a first end of the third branch being communicated with the discharge port, a second end of the third branch being communicated with a pipeline between the fourth throttle valve and the second end of the first part; 
 a second on-off valve, connected in series with the third branch; 
 a fifth branch, a first end of the fifth branch being communicated with the discharge port, a second end of the fifth branch being communicated with a pipeline between the fifth throttle valve and the second end of the second part; 
 an eighth throttle valve, connected in series with the fifth branch; 
 a sixth branch, a first end of the sixth branch being communicated with the pipeline between the fourth throttle valve and the second end of the first part, a second end of the sixth branch being communicated with a pipeline between the first on-off valve and the first end of the second part; and 
 a ninth throttle valve, connected in series with the sixth branch. 
   
     
     
         15 . The air conditioning system according to  claim 12 , further comprising:
 a first subcooling device, connected in a pipeline between the fourth throttle valve and the second end of the indoor heat exchanger, and configured to reduce a temperature of refrigerant entering the fourth throttle valve from the indoor heat exchanger; and   a second subcooling device, connected in a pipeline between the fifth throttle valve and the second end of the indoor heat exchanger, and configured to reduce a temperature of refrigerant entering the fifth throttle valve from the indoor heat exchanger.   
     
     
         16 . The air conditioning system according to  claim 1 , further comprising a controller; the controller satisfies one of the following:
 the controller is configured to:   if the air conditioning system satisfies a defrost start condition, adjust an operating mode of the air conditioning system to the first defrosting mode to defrost the first part;   if the defrosting of the first part is complete, adjust the operating mode of the air conditioning system to the second defrosting mode to defrost the second part; and   if the defrosting of the second part is complete, control the air conditioning system to exit the second defrosting mode;   or,   the controller is configured to:   if the air conditioning system satisfies the defrost start condition, adjust the operating mode of the air conditioning system to the second defrosting mode to defrost the second part;   detect whether the defrosting of the second part is complete;   if the defrosting of the second part is complete, adjust the operating mode of the air conditioning system to the first defrosting mode to defrost the first part; and   if the defrosting of the first part is complete, control the air conditioning system to exit the first defrosting mode.   
     
     
         17 . The air conditioning system according to  claim 1 , further comprising a controller; the controller satisfies one of the following:
 the controller is configured to:   adjust an operating mode of the air conditioning system to the first defrosting mode to defrost the first part;   control the first fan to stop operating and control the second fan to operate normally;   if a defrosting of the first part is complete, adjust the operating mode of the air conditioning system to the second defrosting mode to defrost the second part;   control the second fan to stop operating and control the first fan to operate; and   if a defrosting of the second part is complete, control the air conditioning system to exit the second defrosting mode;   or,   the controller is configured to:   adjust an operating mode of the air conditioning system to the second defrosting mode to defrost the second part;   control the second fan to stop operating and control the first fan to operate normally;   if a defrosting of the second part is complete, adjust the operating mode of the air conditioning system to the first defrosting mode to defrost the first part;   control the first fan to stop operating and control the second fan to operate; and   if a defrosting of the first part is complete, control the air conditioning system to exit the first defrosting mode.   
     
     
         18 . The air conditioning system according to  claim 17 , further comprising an indoor unit fan;
 the controller satisfies at least one of the following:   the controller is further configured to: when adjusting the operating mode of the air conditioning system to the first defrosting mode, control the indoor unit fan to stop operating;   or,   the controller is further configured to: when adjusting the operating mode of the air conditioning system to the second defrosting mode, control the indoor unit fan to stop operating.   
     
     
         19 . The air conditioning system according to  claim 17 , further comprising an indoor unit fan;
 the controller satisfies at least one of the following:   the controller is configured to: when adjusting the operating mode of the air conditioning system to the first defrosting mode, control a rotational speed of the indoor unit fan to be a first preset rotational speed n;   or,   the controller is configured to: when adjusting the operating mode of the air conditioning system to the second defrosting mode, control the rotational speed of the indoor unit fan to be the first preset rotational speed n;   wherein, the first preset rotational speed is less than a maximum rotational speed of the indoor unit fan.   
     
     
         20 . The air conditioning system according to  claim 19 , wherein the controller is further configured to:
 before the air conditioning system exits the defrosting mode, determine a discharge pressure Pd of the discharge port;   compare the discharge pressure Pd with a first threshold pressure Pdomax and a second threshold pressure Pdomin respectively to obtain a comparison result;   if the discharge pressure Pd≥the first threshold pressure Pdomax, adjust the rotational speed of the indoor unit fan to a first rotational speed n 1 ; if the discharge pressure Pd≤the second threshold pressure Pdomin, adjust the rotational speed of the indoor unit fan to a second rotational speed n 2 ; if the second threshold pressure Pdomin<the discharge pressure Pd<the first threshold pressure Pdomax, maintain the rotational speed of the indoor unit fan at the first preset rotational speed n;   wherein, the first rotational speed n 1 >the first preset rotational speed n, 0≤the second rotational speed n 2 <the first preset rotational speed n, the first preset rotational speed n>0 and the second threshold pressure Pdomin<the first threshold pressure Pdomax.