Device for the concentration of solar radiation, comprising an inflatable concentrator cushion

A device for the concentration of solar radiation in an absorber, comprising an inflatable concentrator cushion, which comprises a cover film element comprising a light-permeable entry window for coupling in solar radiation and a reflector film, which sub-divides the concentrator cushion into at least two hollow spaces, for the concentration of solar radiation in an absorber, comprising a pivoting apparatus, by means of which the concentrator cushion is pivotable, and comprising a retaining apparatus assembled on the pivoting apparatus, for retaining the concentrator cushion, which retaining apparatus comprises an upper longitudinal member, which extends in the longitudinal direction of the concentrator cushion for suspending the absorber, wherein the upper longitudinal member is arranged on a substantially air-tight closed upper passage opening of the concentrator cushion, wherein an adjusting device is provided between the upper longitudinal member of the retaining apparatus and the pivoting apparatus, by which adjusting device the distance between the upper longitudinal member and the pivoting apparatus is adjustable.