Dovetail type low-pressure expansion water tank installing structure

The utility model discloses a dovetail type low-pressure expansion water tank installing structure. The installing structure is characterized by comprising an expansion water tank and a fan motor assembly. The expansion water tank comprises a connecting pipe and a water tank case which are connected. The expansion water tank is arranged at the tail of a case of the fan motor assembly. The case of the motor assembly is provided with a round air protecting ring. One side, close to the air protecting ring, of the water tank case is of an arc shape corresponding to the edge of the round air protecting ring. The other side of the water tank case is flush with the edge of the case of the motor assembly. A clamping tongue is arranged at the upper end of the tail of the case of the fan motor assembly. The water tank case is vertically provided with a clamping groove upwards from the bottom, wherein the clamping groove corresponds to the clamping tongue. According to the installing structure, the low-pressure expansio