Air injection device suitable for microbubble drag reduction

The air injection device comprises an embedded part and an air injection plate, the embedded part is detachably and fixedly arranged on the upper portion of the air injection plate, an inner cavity where the embedded part and the air injection plate are connected forms an air mixing cavity, and a hollow shaft is arranged in the center of the top of the embedded part; a gas inlet for a gas mixing cavity in a gas machine is formed in the end part of the hollow shaft, a plurality of gas spraying through holes are formed in the gas spraying plate, the side surface of the gas spraying plate is sunken to form a watertight groove, and a waterproof rubber ring is arranged in the watertight groove. Micro-bubble forming and spraying of micro-bubble drag reduction can be achieved, and the watertight performance of a ship body is guaranteed while the micro-bubble drag reduction efficiency is guaranteed. 本发明涉及一种适用于微气泡减阻的喷气装置，包括预埋件和喷气板，所述预埋件可拆卸的固定设置在喷气板上部，所述预埋件和喷气板连接的内腔形成混气腔，所述预埋件顶部中心设置空心轴，所述空心轴端部设置有供气体机内混气腔的进气口，所述喷气板上设置多个