Device for extracting cakes resulting from pressurized disc filtration, and associated extraction method

A device for extracting cakes resulting from pressurized filtration, the device comprising a sealed vessel in which rotary filters are housed, said vessel being provided with a hopper for collecting solid particles, said hopper being extended longitudinally in the lower part by an airlock defined between at least two temporary-closure elements, wherein each temporary-closure element comprises a rotary shaft which is arranged transversely in the airlock and includes at least one set of two diametrically opposed radial blades, an overall surface area of which corresponds approximately to a cross section of the airlock,

• peripheral sealing means associated with each temporary-closure element, mounted on an inner wall of the airlock, facing peripheral outer end edges of said set of blades, and including a single annular expandable seal mounted on the inner wall of the airlock, when expanded the single annular expandable seal expands in a plane perpendicular to a longitudinal axis of the airlock and contacts the entire length of the peripheral outer end edges of said set of blades to seal the air lock around the entire length of the periphery of the set of blades, the single annular expandable seal containing the axis of rotation of the blades and sealing the transversal section of the airlock.