Flexible pressure line twist capsule rotary union for steerable spacecraft radiator
A twist capsule rotary joint system for passing a fluid through a pressure hull without a dynamic seal. A rotating cylindrical drum positioned outboard of the pressure hull is adapted to be driven in a reciprocating manner through an angle and backward through the same angle. At least one outboard pressure line or hose has a first end attached to a fixed connector that extends through the pressure hull near and radially outward of the rotating cylindrical drum. A second end of the outboard pressure line or hose is attached to a connector that extends through the top outboard surface of the drum. As the drum rotates, the pressure line wraps around the drum, or unwraps from the drum. In an exemplary embodiment, two pressure lines carry two-phase coolant through the pressure hull of a spacecraft in support of a rotating radiator that is adapted to rotate to present a minimum surface area toward the sun.
1. A twist capsule rotary joint system for passing a fluid through a pressure hull, comprising:
a rotating cylindrical member positioned outboard of the pressure hull adapted to rotate about an axis extending away from the pressure hull, and adapted to be driven in a reciprocating manner around that axis through an angle and backward through the same angle;
at least one outboard pressure line having a first end attached to a fixed connector that extends through the pressure hull near and radially outward of the rotating cylindrical member; and a second end of the at least one outboard pressure line being attached to a connector that extends through a top outboard surface of the rotating cylindrical member; such that as the cylindrical member rotates in one direction, the at least one outboard pressure line wraps around the cylindrical member, and as the cylindrical member rotates in an opposite direction, the at least one outboard pressure line unwraps from the cylindrical member.
2. A twist capsule rotary joint system in accordance with claim 1 ,
wherein the pressure hull is the pressure hull of a spacecraft, and
wherein the at least one outboard pressure line comprises two pressure lines carrying two-phase coolant through the pressure hull to and from a steerable radiator that is adapted to be steered to an orientation with a minimum surface area toward the sun.