Airplane built-in circulating device air inlet

The utility model provides an air inlet of a built-in circulating device of an airplane, and the air inlet comprises an air guide duct which comprises an equal straight section and a contraction section connected with the equal straight section; the air inlet lip is arranged on the equal straight section; the machine body air duct opening is formed in the air entraining air duct; the edge is arranged on the air entraining duct; wherein the edge can be connected with the machine body; the opening direction of the air inlet lip is the same as the course of an airplane; wherein the air inlet lip is detachably connected with the end part of the equal straight section; the utility model provides an air inlet of a built-in circulating device of an airplane, which not only can meet the requirement of the actual use air entraining amount of the built-in circulating device of a certain middle-large-sized airplane, but also gives consideration to the appearance of the air inlet with a good aerodynamic characteristic. 本