Heat exchanger and air conditioning unit having multiple refrigeration systems

An air conditioning unit having multiple refrigeration systems, comprising:

• a plurality of refrigeration systems, at least two refrigeration systems of the plurality of refrigeration systems sharing at least one heat exchanger, the heat exchanger being an evaporator and/or a condenser of the at least two refrigeration systems,
• wherein the heat exchanger comprises:
• a first collecting tube and a second collecting tube, the first collecting tube comprising a first peripheral wall and a first main channel, and a wall surrounding the first main channel comprising the first peripheral wall;
• a plurality of heat exchange tubes spaced apart along a length direction of the first collecting tube, the heat exchange tube being coupled to the first collecting tube, the heat exchange tube being coupled to the second collecting tube, the plurality of heat exchange tubes comprising a plurality of first heat exchange tubes and a plurality of second heat exchange tubes, the first heat exchange tube and the second heat exchange tube being alternately arranged along the length direction of the first collecting tube, and at least two second heat exchange tubes being arranged adjacent to the first heat exchange tube in the length direction of the first collecting tube;
• a first assembly located in the first main channel, the first main channel comprising a first flow channel and a second flow channel, at least part of the first assembly being fixedly coupled to an inner wall surface of the first collecting tube, the first flow channel comprising a first channel and a plurality of first lumens, the first channel extending in the length direction of the first collecting tube and in communication with the plurality of first lumens, the second flow channel comprising a second channel and a plurality of second lumens, the second channel extending in the length direction of the first collecting tube and in communication with the plurality of second lumens, the first lumen and the second lumen being alternately arranged along the length direction of the first collecting tube, the first assembly separating the first lumen from the second lumen, the first lumen and the second lumen being not in communication with each other, the first lumen being in communication with the first heat exchange tube, and the second lumen being in communication with the second heat exchange tube;
• a first inlet-outlet tube in communication with the first channel;
• and
• a second inlet-outlet tube in communication with the second channel.