Structure for installing longitudinal beam in vehicle

A structure for installing a longitudinal beam in a vehicle comprises a longitudinal beam body which is hanged below a vehicle hanging arm, a through cavity is formed in the longitudinal beam body and serves as a static pressure air cavity, an air inlet communicated with the static pressure air cavity is formed in the upper end of the longitudinal beam body, and the air inlet is in butt joint with a vehicle air duct outlet; an air outlet which is located below a middle roof plate of vehicle and communicated with the static pressure air cavity is formed in the side wall, close to the middle roof plate of the vehicle, of the longitudinal beam body, and a drainage plate whose tail part extends to the inside of the vehicle is arranged in the position, below the air outlet, of the longitudinal beam body. A profile cavity provides the static pressure air cavity for an air conditioning system, the air outlet is formed in the side part, air blown out blows to the middle in the vehicle along the middle roof plate under the drainage action of the drainage plate and the middle roof plate, and airflow flows downwards after reaching the middle in the vehicle, so that tender outlet air is obtained, a noise reduction effect is realized, and the riding comfort is improved.