Heat exchanger, pipeline structure and air conditioner

The invention provides a heat exchanger, a pipeline structure and an air conditioner. The expansion cooling fins are arranged on the heat exchanger main body, each expansion cooling fin comprises a heat exchange area and an expansion area protruding out of the heat exchanger main body, and a refrigerant flow path for refrigerant circulation is arranged on each expansion area; the refrigerant flow path is connected with an external system and receives a refrigerant from the external system; the refrigerant flow path comprises a heat exchanger communicating port which is connected with the heat exchanger body. According to the heat exchanger, the technical problem that in the related technology, the occupied space of pipeline system pipe arrangement is large is solved. 本发明提供了一种换热器、管路结构和空调器，包括：换热器主体；拓展散热片，拓展散热片设置在换热器主体上，拓展散热片包括换热区和凸出于换热器主体设置的拓展区，拓展区上设置有供冷媒流通的冷媒流路；冷媒流路与外部系统连接并接收来自外部系统的冷媒；冷媒流路包括换热器连通口，换热器连通口与换热器主体连接。本发明中的换热器解决了相关技术中管路系统走管占用空间大的技术问题。