Heat exchanger for air conditioner

The utility model relates to a heat exchanger for an air conditioner, which comprises a U-shaped pipe, fins and sideboards. The fins are in expanded joint with the outside of the U-shaped pipe, and the fins and the sideboards are respectively provided with a connection slot for inserting the U-shaped pipe. The U-shaped pipe comprises a main body with a cavity, the inner circumferential face of the main body of the U-shaped pipe is provided with a plurality of toothed ribs extending along the axial direction of the main body, and a channel is formed between adjacent toothed ribs. The heat exchanger is capable effectively increasing effective heat exchanging area of the pipe inner wall, and increasing turbulence degree and capillary action of liquid inside the pipe, thereby having ideal heat exchanging capability, further the heat exchanging efficiency is equal to that of a copper tube with same outer diameter while coolant charging rate is less than that of the external copper tube, and consumption of aluminum