Ejector refrigeration system

Abstract

This application provides an ejector refrigeration system including: a compressor having a suction port and a discharge port; a first heat exchanger connected to the discharge port of the compressor to receive a fluid working medium flowing out from the discharge port of the compressor; and an ejector including a primary flow inlet connected to the first heat exchanger to receive a fluid working medium from the first heat exchanger, a secondary flow inlet, and an ejector outlet connected to the suction port of the compressor to return a fluid working medium entering the ejector to the suction port of the compressor; and a phase adjustment mechanism configured to adjust a phase state of the fluid working medium entering the primary flow inlet of the ejector or adjust a gas-liquid ratio of the fluid working medium at the primary flow inlet, thereby enabling the ejector to generate sufficient pressure lift.

1 . An ejector refrigeration system comprising:
 a compressor having a suction port and a discharge port;   a first heat exchanger connected to the discharge port of the compressor to receive a fluid working medium flowing out from the discharge port of the compressor; and   an ejector including a primary flow inlet connected to the first heat exchanger to receive a fluid working medium from the first heat exchanger, a secondary flow inlet, and an ejector outlet connected to the suction port of the compressor to return a fluid working medium entering the ejector to the suction port of the compressor, wherein   the ejector refrigeration system further comprises:   a phase adjustment mechanism configured to adjust a phase state of the fluid working medium entering the primary flow inlet of the ejector.   
     
     
         2 . The ejector refrigeration system according to  claim 1 , wherein the phase adjustment mechanism is configured to adjust the fluid working medium entering the primary flow inlet of the ejector into a gas-liquid two-phase state in response to an external ambient temperature being lower than a specified value. 
     
     
         3 . The ejector refrigeration system according to  claim 1 , further comprising:
 a second heat exchanger; and   a gas-liquid separator including an inlet connected to the ejector outlet, a gas outlet connected to the suction port of the compressor, and a liquid outlet connected to the secondary flow inlet via the second heat exchanger.   
     
     
         4 . The ejector refrigeration system according to  claim 1 , further comprising:
 a differential pressure sensor configured to measure a differential pressure between the secondary flow inlet of the ejector and the ejector outlet, the phase adjustment mechanism being in communication connection with the differential pressure sensor, or   the ejector refrigeration system further comprising:   a pressure detection assembly configured to detect pressures of the ejector outlet and the secondary flow inlet, the phase adjustment mechanism being in communication connection with the pressure detection assembly.   
     
     
         5 . The ejector refrigeration system according to  claim 1 , further comprising:
 a dryness sensor disposed at the primary flow inlet, the phase adjustment mechanism being in communication connection with the dryness sensor.   
     
     
         6 . The ejector refrigeration system according to  claim 1 , further comprising:
 an expansion valve disposed between the primary flow inlet and the first heat exchanger, wherein   the phase adjustment mechanism is a mechanism for controlling an opening degree of the expansion valve.   
     
     
         7 . The ejector refrigeration system according to  claim 1 , wherein
 the phase adjustment mechanism is a mechanism for controlling a rotation speed of a fan of the first heat exchanger.   
     
     
         8 . The ejector refrigeration system according to  claim 1 , further comprising:
 a bypass pipeline connected, at one end, between the discharge port of the compressor and the first heat exchanger, and connected, at the other end, between an outlet of the first heat exchanger and the primary flow inlet; and   a first opening regulating valve disposed in the bypass pipeline, wherein   the phase adjustment mechanism is a mechanism for adjusting an opening degree of the first opening regulating valve.   
     
     
         9 . The ejector refrigeration system according to  claim 1 , further comprising:
 a reservoir including:   a reservoir inlet communicating with a first pipe section of the first heat exchanger to receive a fluid working medium at an outlet of the first pipe section;   a reservoir liquid refrigerant outlet communicating with a second pipe section of the first heat exchanger; and   a reservoir gaseous refrigerant outlet located at the top of the reservoir and connected between an outlet of the first heat exchanger and the primary flow inlet.   
     
     
         10 . The ejector refrigeration system according to  claim 9 , further comprising:
 a second opening regulating valve disposed between the reservoir gaseous refrigerant outlet and the primary flow inlet, wherein   the phase adjustment mechanism is a mechanism for adjusting an opening degree of the second opening regulating valve.