The invention discloses an
environmental humidity control method for a sealed cavity. A
drying gas
branch circuit and a
wetting gas
branch circuit are supplied, wherein the
drying gas
branch circuit is connected with a three-way gas joint after being dried and regulated and controlled by a gas flowmeter; the
wetting gas branch circuit is connected with the three-way gas joint after being wetted and regulated and controlled by the flowmeter; the
drying gas and the
wetting gas are converged into one path at the three-way gas joint to enter an environmental
gas chamber of the sealed cavity; and the
humidity control in the environmental
gas chamber of the sealed cavity is adjusted by the charged flow proportion of the drying flowmeter gas and the wetting flowmeter gas. A device mainly comprises a drying gas source (12), a drying device (14), a drying gas flowmeter (16), a wetting gas source (10), a water tank (8), a wetting gas flowmeter (16), the three-way gas joint (4) and the environmental
gas chamber (2) of the sealed cavity. The invention has simple, economic and practical control way, large regulating and control
humidity range, simple equipment structure, convenient use,
environmental protection and no
pollution and can meet the use requirement of special
atmosphere humidity in the sealed cavity.