Abstract: An economizer and an air conditioning system. The economizer includes a housing with a refrigerant inlet for connecting to a first heat exchanger, a refrigerant outlet for connecting to a second heat exchanger, and a suction port for connecting to an intermediate stage of a compressor provided thereon; and a choke portion configured to protrude inwardly from an inner wall of the housing and arranged close to the suction port, such that refrigerant flowing to the suction port is at least partially obstructed. According to the technical solutions of the present application, the refrigerant flowing to the suction port can be at least partially obstructed. When the liquid droplets carried by the refrigerant are obstructed by the choke portion, the liquid droplets are adsorbed on the wall surface to form a liquid film, and the movement of the liquid film is obstructed by the choke portion.

Abstract: The invention relates to a heat exchange fin, with a tube hole formed thereon for a heat exchange tube to be inserted into. A corrugated structure is arranged near the tube hole. The corrugated structure comprises a wave section arranged along a flow direction of fluid medium. The distance between two adjacent wave crests or wave troughs of the wave section is one wavelength. The total length of the wave section is 1-1.5 times the wavelength. A bridge plate is arranged at the wave crests and wave troughs of the wave section, respectively. The bridge plate deflects relative to the wave crests and wave troughs by a preset distance. The invention also proposes a heat exchanger configured with the heat exchange fins, and a heat pump system configured with the heat exchanger.

Abstract: An economizer and an air conditioning system. The economizer includes a housing with a refrigerant inlet for connecting to a first heat exchanger, a refrigerant outlet for connecting to a second heat exchanger, and a suction port for connecting to an intermediate stage of a compressor provided thereon; and a choke portion configured to protrude inwardly from an inner wall of the housing and arranged close to the suction port, such that refrigerant flowing to the suction port is at least partially obstructed. According to the technical solutions of the present application, the refrigerant flowing to the suction port can be at least partially obstructed. When the liquid droplets carried by the refrigerant are obstructed by the choke portion, the liquid droplets are adsorbed on the wall surface to form a liquid film, and the movement of the liquid film is obstructed by the choke portion.