Patent ID: 8893781

Claim:
A separating device for removing sand and rock particles in an extraction of liquids or gases from wells drilled in rock, comprising a plurality of annular discs ( 1 ) of a brittle-hard material stacked one on top of another and axially braced by a supporting structure ( 7 ) having springs ( 15 ) configured to avoid widening of a gap between the supporting structure and the stack of annular discs, the discs ( 1 ) having on their upper side ( 2 ) at least three spacers ( 3 ) uniformly distributed over a circular circumference of the discs ( 1 ), the discs ( 1 ) being stacked one on top of the other in such a way that the spacers ( 3 ) respectively lie one over the other, and that a separating gap ( 5 ) with a height of 0.05-1 mm is present in each case between the individual discs ( 1 ).