Patent ID: 9140272
Filing Date: 2015-09-22
Classification: F02K,F04D,Y10T

Abstract:
1. A ram air fan outer housing for directing air from a ram air fan rotor and air from a ram air bypass into a ram air fan outlet, the outer housing comprising: an outer cylinder having a ram air fan rotor end and a ram air fan outlet end, the ram air fan rotor end and the ram air fan outlet end at opposite ends of an axis of the outer cylinder; the outer cylinder including walls comprised of a laminate stacking sequence of at least four adjacent outer cylinder layers of plain-weave carbon-fiber fabric, each layer of the four adjacent outer cylinder layers having a weave orientation such that a first outer cylinder layer and a fourth outer cylinder layer are oriented forty-five degrees from each of a second outer cylinder layer and a third outer cylinder layer, the second outer cylinder layer and the third outer cylinder layer sandwiched between the first outer cylinder layer and the fourth outer cylinder layer, wherein the outer cylinder further includes an outer cylinder support ridge extending along at least a portion of the outer cylinder in a plane perpendicular to the axis of the cylinder, and comprising a protruding section of the outer cylinder wall; and a plenum for directing air from the ram air bypass into the outer cylinder, the plenum including walls comprised of a laminate stacking sequence of at least four adjacent plenum layers of plain-weave carbon-fiber fabric, each layer of the four adjacent plenum layers having a weave orientation such that a first plenum layer and a fourth plenum layer are oriented forty-five degrees from each of a second plenum layer and a third plenum layer, the second plenum layer and the third plenum layer sandwiched between the first plenum layer and the fourth plenum layer, wherein the plenum is joined to the outer cylinder at a joint region, the joint region comprised of a laminate stacking sequence of at least eight adjacent layers of plain-weave carbon-fiber fabric, the joint region laminate stacking sequence formed by interleaving the four adjacent outer cylinder layers in the joint region with the four adjacent plenum layers in the joint region.