Patent ID: 7785043
Filing Date: 2010-08-31
Classification: F16L,F17D

Abstract:
1. An apparatus for controlling or regulating the distribution of particles in dust or granule form in carrier gas stream transportable in a conveying pipe of arbitrary cross section from a particle source, comprising at least one device capable of being controlled or regulated in various shutoff positions and thus influencing the carrier gas stream being associated with the conveying pipe, each device comprising a plurality of shutoff elements synchronously oppositely or individually pivotable about respective pivot axes extending substantially perpendicularly to a longitudinal axis of the conveying pipe between at least a first position not inclined with respect to a plane perpendicular to the longitudinal axis of the conveying pipe and a second position parallel to the longitudinal axis of the conveying pipe, wherein the shutoff elements together have, in their first positions, a ring shape with their outer peripheries adapted to the inner outline of the conveying pipe such that their outer peripheries lie substantially against the inner wall of the conveying pipe and their inner peripheries delimit between them a tubular free conveying cross section smaller than the cross-section of the conveying pipe, wherein, in their second positions, the shutoff elements are parallel to one another in the diametral region or have respective major surfaces lying flat against one another, and wherein each of the shutoff elements exhibits, in cross section, an airfoil shape having a first leading rounded edge facing the direction of flow of the carrier gas stream at least in the second position and a second trailing edge opposite the leading edge having a sharper profile than the first leading rounded edge.