Small-sized air feeder in closed narrow working space

The utility model relates to the technical field of indoor ventilation engineering, in particular to a small air feeder in a closed narrow operation space, which comprises a casing, a first partition plate fixedly mounted on the inner wall of the casing, a humidifying component arranged between the inside of the casing and the first partition plate, and a second partition plate fixedly mounted on the inner wall of the casing. An air supply assembly is arranged between the first partition plate and the second partition plate, an outer pipeline is fixedly installed on one side of the machine shell, an inner pipeline is fixedly installed on the side, away from the outer pipeline, of the machine shell, the surface of the inner pipeline is movably sleeved with a connecting pipe, and three clamping assemblies are arranged on the outer surface of the connecting pipe. The dovetail groove slides to the surface of the dovetail joint, when the triangular block slides on the surface of the dovetail joint, the spring is p