Delivery systems for pressure protecting and delivering a submerged payload and methods for using the same
A payload delivery unit for protecting and delivering a payload submerged in a submersion medium comprises a container including a pressure resistant shell and a resilient seal device. The shell defines a containment chamber and includes first and second shell members having opposed first and second sealing faces, respectively. The seal device engages and is interposed between the first and second sealing faces. The container is configured and constructed such that: when the submersion medium applies an exterior pressure to the first and second shell members such that a shell pressure differential, defined as the exterior pressure less an interior pressure of the containment chamber, exceeds a prescribed pressure, the first and second shell members compressively load and deform the seal device to effect a seal between the first and second shell members that prevents ingress of the submersion medium into the containment chamber; and when the shell pressure differential is less than the prescribed pressure, the seal device elastically rebounds to separate the first and second shell members to permit ingress of the submersion medium into the containment chamber.
1. A payload delivery unit for protecting and delivering a payload submerged in a submersion medium, the payload delivery unit comprising a container including:
a pressure resistant shell defining a containment chamber and including first and second shell members having opposed first and second sealing faces, respectively; and
a resilient seal device engaging and interposed between the first and second sealing faces;
wherein the container is configured and constructed such that:
when the submersion medium applies an exterior pressure to the first and second shell members such that a shell pressure differential, defined as the exterior pressure less an interior pressure of the containment chamber, exceeds a prescribed pressure, the first and second shell members compressively load and deform the seal device to effect a seal between the first and second shell members that prevents ingress of the submersion medium into the containment chamber, wherein the compressively loaded and deformed seal device operates as a biasing device tending to mechanically force the first and second shell members apart from one another; and
when the shell pressure differential is less than the prescribed pressure, the seal device elastically rebounds to automatically mechanically force or assist in automatically mechanically forcing the first and second shell members apart from one another to permit ingress of the submersion medium into the containment chamber.
2. The payload delivery unit of claim 1 wherein the container is configured and constructed such that:
when the payload delivery unit is located at or below a prescribed depth in the submersion medium, the first and second shell members compressively load and deform the seal device to effect the seal between the first and second shell members to prevent ingress of the submersion medium into the containment chamber; and
when the payload delivery unit is located above the prescribed depth, the seal device elastically rebounds to passively, automatically separate the first and second shell members to permit ingress of the submersion medium into the containment chamber.
3. The payload delivery unit of claim 2 wherein the prescribed depth is in the range of from about 0 to 100 meters.
4. The payload delivery unit of claim 2 wherein, when the payload delivery unit is located above the prescribed depth, the seal device rebounds to fully passively, automatically separate the first and second shell members to permit ingress of the submersion medium into the containment chamber.
5. The payload delivery unit of claim 1 including a pressure generator operable to selectively increase the interior pressure to actively reduce the pressure differential.
6. The payload delivery unit of claim 1 wherein the interior pressure of the containment chamber is less than atmospheric.
7. The payload delivery unit of claim 1 wherein the seal device is formed of an elastomeric material.
8. The payload delivery unit of claim 1 wherein the seal device has a durometer in the range of from about 10 to 90 Shore A.
9. The payload delivery unit of claim 1 wherein the first and second shell members are hemispherical, and the seal device and the first and second sealing faces are substantially annular.
10. The payload delivery unit of claim 1 wherein the first shell member has a seal channel defined in the first sealing face and the seal device is disposed in the seal channel.
11. The payload delivery unit of claim 1 wherein the seal device has a textured surface engaging at least one of the first and second shell members.
12. The payload delivery unit of claim 1 including a payload disposed in the containment chamber.
13. The payload delivery unit of claim 1 wherein the container is configured such that the first and second shell members fully separate and detach from one another after the first and second shell members are forced apart.
14. A method for protecting and delivering a payload submerged in a submersion medium, the method comprising:
providing a payload delivery unit comprising a container including:
a pressure resistant shell defining a containment chamber and including first and second shell members having opposed first and second sealing faces, respectively; and
a resilient seal device engaging and interposed between the first and second sealing faces;
submerging the container with the payload mounted in the containment chamber;
maintaining the payload delivery unit in a sealed condition wherein the submersion medium applies an exterior pressure to the first and second shell members such that a shell pressure differential, defined as the exterior pressure less an interior pressure in the containment chamber, exceeds a prescribed pressure, whereby the shell members compressively load and deform the seal device to effect a seal between the first and second shell members that prevents ingress of the submersion medium into the containment chamber, wherein the compressively loaded and deformed seal device operates as a biasing device tending to mechanically force the first and second shell members apart from one another; and thereafter
causing the shell pressure differential to become less than the prescribed pressure, whereupon the seal device elastically rebounds to automatically mechanically force or assist in automatically mechanically forcing the first and second shell members apart from one another to permit ingress of the submersion medium into the containment chamber.
15. The method of claim 14 wherein:
maintaining the payload delivery unit in a sealed condition includes maintaining the payload delivery unit at a first depth or depths at or below a prescribed depth in the submersion medium, responsive to which the first and second shell members compressively load and deform the seal device to effect the seal between the first and second shell members that prevents ingress of the submersion medium into the containment chamber; and
causing the pressure differential to become less than the prescribed pressure includes permitting the payload delivery unit to rise to a second depth above the prescribed depth, responsive to which the seal device elastically rebounds to passively, automatically separate the first and shell members to permit ingress of the submersion medium into the containment chamber.
16. The method of claim 15 wherein, when the payload delivery unit is located at the second depth, the seal device elastically rebounds to fully passively, automatically separate the first and second shell members to permit ingress of the submersion medium into the containment chamber.
17. The method of claim 14 wherein:
the payload delivery unit includes a pressure generator; and
causing the pressure differential to become less than the prescribed pressure includes selectively increasing the interior pressure to actively reduce the pressure differential using the pressure generator.
18. The method of claim 14 including, after and as a result causing the pressure differential to become less than the prescribed pressure and permit ingress of the submersion medium into the containment chamber, separating the first and second shell members and releasing the payload from the container.
19. The method of claim 14 including scuttling at least one of the first and second shell members after forcing the first and second shell members apart from one another.
20. The method of claim 14 including fully separating and detaching the first and second shell members from one another after the first and second shell members are forced apart.