Moisture absorbind device for electrical apparatus using a dielectric gas

摘要

The humidity absorber with a molecular screen for an electrical apparatus with a dielectric gas consists of a housing (4) containing the screen (5) and closed by a plate (7) equipped with a valve (8) for creating a vacuum inside the housing. The plate is held in place on a flange inside the housing by the pressure difference between the inside and outside of the housing after the vacuum has been created inside it. One or more concentric seals (9,10) are fitted between the plate and flange surface and in a variant of the design a spring can be fitted between the plate and flange. The humidity absorber is fitted over an aperture (2) in the wall of the electrical apparatus, the aperture being fitted with a grille (12) to keep the plate from penetrating the apparatus when it is separated from the housing.