Flow-equalizing air supply device for wall-attached ventilation of cylinder

The utility model belongs to the technical field of heating, ventilating and air conditioning, and relates to a flow-equalizing air supply device for cylinder wall-attaching ventilation, which comprises a first shell, an upper-layer pore plate, a second shell, a lower-layer pore plate, a third shell and an air outlet plate which are sequentially communicated from top to bottom and are respectively formed by splicing two semicircular ring bodies, a flow guide plate is mounted at the joint of the two semicircular ring bodies of the first shell; an air inlet is formed in one side of each of the two semicircular ring bodies of the first shell, and the flow guide plate is located on one side of the air inlet; a ventilation area is formed on the upper-layer pore plate, has an eccentric distance from the center of the cylindrical body, and is deviated to one side of the air inlet; a plurality of rows of air supply orifices are formed in the lower-layer pore plate; and the air outlet plate is provided with an annular