Two-pipe enhanced-vapor-injection outdoor unit and multi-split system

Abstract

A two-pipe enhanced-vapor-injection outdoor unit and a multi-split system are provided. The two-pipe enhanced-vapor-injection outdoor unit includes: an outdoor heat exchanger; a compressor including a gas discharge port, the gas return port and an injection port; a reversing assembly including a first end connected with the gas discharge port, and a second end connected with the gas return port; a flash evaporator comprising a refrigerant inlet, a gas outlet and a liquid outlet, the gas outlet being connected with the injection port, the liquid outlet being connected with the first port and the inlet of the outdoor heat exchanger, respectively; a throttling assembly including a first end connected with the refrigerant inlet, and a second end connected with the second port; and a first pipe.

1 . A two-pipe enhanced-vapor-injection outdoor unit, comprising:
 an outdoor heat exchanger, a first port and a second port;   an enhanced-vapor-injection compressor comprising a gas discharge port, a gas return port and an injection port;   a reversing assembly comprising a first end connected with the gas discharge port and a second end connected with the gas return port;   a flash evaporator comprising a refrigerant inlet, a gas outlet and a liquid. outlet, the gas outlet being connected with the injection port, the liquid outlet being connected with the first port and an inlet of the outdoor heat exchanger, respectively;   a throttling assembly comprising a first end connected with the refrigerant inlet and a second end connected with the second port; and   a first pipe comprising a first end connected with an outlet of the outdoor heat exchanger and a second end connected between the throttling assembly and the second port.   
     
     
         2 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the reversing assembly further comprises:
 a third end switchably connected to the inlet of the outdoor heat exchanger or the outlet of the outdoor heat exchanger; and   a fourth end switchably connected to the second port or the first port.   
     
     
         3 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a first solenoid valve arranged between the gas outlet and the injection port, and having a conduction direction from the gas outlet to the injection port.   
     
     
         4 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a first check valve arranged in the first pipe, and having a conduction direction from the outlet of the outdoor heat exchanger to the throttling assembly.   
     
     
         5 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a second check valve connecting the first port to the liquid outlet, and having a conduction direction from the liquid outlet to the first port; and   a third check valve connecting the second port to the throttling assembly, and having a conduction direction from the second port to the throttling assembly.   
     
     
         6 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a fourth check valve connecting the second port to a fourth end of the reversing assembly, and having a conduction direction from the second port to the fourth end of the reversing assembly; and   a fifth check valve connecting the first port to the fourth end of the reversing assembly, and having a conduction direction from the fourth end of the reversing assembly to the first port.   
     
     
         7 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a sixth check valve connecting a third end of the reversing assembly to the inlet of the outdoor heat exchanger, and having a conduction direction from the third end of the reversing assembly to the outdoor heat exchanger; and   a seventh check valve connecting the third end of the reversing assembly to the outlet of the outdoor heat exchanger, and having a conduction direction from the outlet of the outdoor heat exchanger to the third end of the reversing assembly.   
     
     
         8 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the throttling assembly comprises at least one throttling device and at least one eighth check valve connected in series, and the eighth check valve has a conduction direction from the second port to the refrigerant inlet. 
     
     
         9 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a second pipe connecting the gas discharge port to the first port; and   a second solenoid valve arranged in the second pipe, and having a conduction direction from the gas discharge port to the first port.   
     
     
         10 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a ninth check valve connecting the inlet of the outdoor heat exchanger to the liquid outlet, and having a conduction direction from the liquid outlet to the inlet of the outdoor heat exchanger.   
     
     
         11 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 1 . 
     
     
         12 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 7 , wherein the throttling assembly comprises at least one throttling device and at least one eighth check valve connected in series, and the eighth check valve has a conduction direction from the second port to the refrigerant inlet. 
     
     
         13 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 7 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a second pipe connecting the gas discharge port to the first port; and   a second solenoid valve arranged in the second pipe, and having a conduction direction from the gas discharge port to the first port.   
     
     
         14 . The two-pipe enhanced-vapor-injection outdoor unit according to  claim 7 , wherein the two-pipe enhanced-vapor-injection outdoor unit comprises:
 a ninth check valve connecting the inlet of the outdoor heat exchanger to the liquid outlet, and having a conduction direction from the liquid outlet to the inlet of the outdoor heat exchanger.   
     
     
         15 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 2 . 
     
     
         16 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 5 , 
     
     
         17 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 7 . 
     
     
         18 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 8 . 
     
     
         19 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 9 . 
     
     
         20 . A two-pipe enhanced-vapor-injection multi-split system, comprising a two-pipe enhanced-vapor-injection outdoor unit according to  claim 10 .