Ventilation cooling air inlet device for engine core cabin

A ventilation cooling air inlet device for an engine core compartment and an engine core compartment including the same, the ventilation cooling air inlet device including: a cylindrical housing which is open at one end as an air inlet portion and defines an opening in a cylindrical wall as an exhaust portion; the movable sliding block is arranged in the cylindrical shell, the movable sliding block can move in the cylindrical shell so as to change the area, covered by the movable sliding block, of the exhaust part, and the movable sliding block comprises a first face making contact with inlet gas and a second face making contact with gas in the core cabin; the movable sliding block is constructed in the mode that when the gas pressure of the first face of the movable sliding block is increased, the movable sliding block moves so that the area, covered by the movable sliding block, of the exhaust part can be increased, and when the gas pressure of the first face of the movable sliding block is reduced, the mov