Patent ID: 8347524

Claim:
A dryer for powdered or granular material comprising: a casing formed by two opposing end walls and one side wall, so as to define within it a chamber for drying material having a longitudinal axis; a shaft which is parallel and eccentric in relation to the said axis of the chamber and provided with operating means to cause it to rotate about its own longitudinal axis, the said shaft comprising a first portion outside the said chamber and a second portion arranged inside the said chamber for mixing the material to be dried; a circular plate that seals an opening of a complementary shape made inside one of the end walls of the casing, the said plate having a hole for the sealed passage of the said shaft and being provided with operating means to cause its rotation about the axis of the chamber also involving the said shaft in this rotational movement, and a frame supporting the casing and the shaft; wherein the edge portion of the said opening closest to the said chamber is made a first circumferential groove which is formed by a first radial cavity having a mouth and by a second radial cavity deeper than the first, joined by an axial portion, in that an annular sealing element made of a non-stick material, having a cross-section comprising at least one axial strip and one radial strip, is inserted into the said first groove in such a way that the radial strip is inserted into the said second cavity and the axial strip occupies the axial portion and the mouth of the said first radial cavity, in that a first sealing ring comprising at least one core of elastomeric material is inserted in the said first cavity so as to radially compress the said axial strip against the plate and in that a second sealing ring comprising at least one core of elastomeric material is inserted into the second cavity so as to axially compress the said radial strip.