Telescoping fluid porting tube
Provided is an electro-hydraulic control system ( 10 ) for controlling the movement of a third structure ( 18 ) of an engine using a power actuator ( 26 ) mountable to the third structure ( 18 ), a telescoping fluid porting tube ( 24 ) for porting a fluid to the power actuator ( 26 ) and a control valve ( 22 ) for controlling the flow of movement to effect the movement of the third structure ( 18 ). In this way, the third structure ( 18 ), such as a nozzle slat of an engine, may be moved via a compact and lightweight electro-hydraulic system.
1. An engine comprising:
a mechanical assembly comprising a first structure, a second structure and a third structure, wherein the first structure is an engine base structure, the second structure is a transcowl, and the third structure is a variable area fan nozzle structure;
an electro-hydraulic control system including:
a power actuator mountable between the second structure and the third structure, the power actuator for moving the third structure,
a telescoping fluid porting tube mountable between the first structure and the second structure for porting a fluid to the power actuator, and
a control valve for controlling flow of the fluid through the telescoping fluid porting tube to the power actuator for effecting movement of the third structure,
wherein the telescoping fluid porting tube has
an outer tubular body having a proximal end for mounting to one of the first structure or the second structure, a distal end opposite the proximal end, and a tubular wall defining a chamber,
a piston axially disposed in and axially translatable within the chamber and having oppositely disposed proximal and distal sides, and
a telescopically movable piston rod having a first end connected to the distal side of the piston and a second end mountable to the other of the first structure or the second structure, the piston rod extending at least partially through the distal end of the outer tubular body and being radially inwardly spaced form the tubular wall, and the piston rod having a fluid passageway in fluidic communication with the chamber, the fluid passageway transferring fluid along a length of the piston rod,
wherein the proximal side of the piston is isolated from any flow through the fluid passageway in the piston rod.
2. The engine of claim 1 , wherein the proximal end of the outer tubular body is open to an environment external to the electro-hydraulic control system.
3. The engine of claim 1 , wherein the outer tubular body has a port fluidically coupled to the control valve for receiving fluid therefrom.
4. The engine of claim 3 , wherein the port extends through the tubular wall of the outer tubular body.
5. The engine of claim 3 , wherein the port is adjacent to the open end of the outer tubular body.
6. The engine of claim 1 , wherein the piston of the electro-hydraulic control system is sealed to an inner portion of the tubular wall to prevent fluidic communication between the proximal end and the fluid passageway when the piston is axially translated.
7. The engine of claim 1 , wherein the piston rod of the electro-hydraulic control system includes at least one opening at the first end extending through a wall of the piston rod for fluidically coupling the chamber to the fluid passageway.
8. The engine of claim 1 , wherein the telescoping fluid porting tube is mountable to at least one of the first structure or the second structure via a gimballing mount.
9. The engine of claim 1 , wherein the telescoping fluid porting tube is a first telescoping fluid porting tube and further including a second telescoping fluid porting tube mounted in tandem with the first telescoping fluid porting tube and mountable between the first structure and the second structure.
10. The engine of claim 9 , wherein the first telescoping fluid porting tube has a first fluid path extending along the fluid passageway of the piston rod and between the control valve and the power actuator for porting fluid for effecting movement of the third structure away from the first structure, and the second telescoping fluid porting tube has a second fluid path extending between the control valve and the power actuator for porting fluid for effecting movement of the third structure towards the first structure.
11. The engine of claim 9 , wherein the first and second telescoping fluid porting tubes are aligned parallel to one another.
12. The engine of claim 1 , further including a pair of power actuators for effecting movement of the third structure relative to at least one of the first structure or the second structure.
13. The engine of claim 1 , further including a control system for regulating a fluid pressure at the power actuator, the control system communicatively connected to both the control valve and to a feedback apparatus mountable to the third structure or locatable to contact the third structure.