Venting system for a jet cutter in the event of deflagration

Patent metadata

Field	Value
Publication number	US-9459080-B2
Application number	US-201414196160-A
Country	US
Kind code	B2
Filing date	Mar 4, 2014
Priority date	Mar 15, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A jet cutter venting apparatus and method for venting gases generated during deflagration. The venting apparatus and method including vent grooves inside the jet cutter providing a pathway for deflagration gases to escape. The venting apparatus and method also may include using notches or holes placed inside the jet cutter to facilitate the venting of gases during deflagration. The venting of the gases during deflagration facilitates pressure relief within the jet cutter and increases safety from accidental detonation during a fire.

First claim

The invention claimed is:

1. A jet cutter assembly comprising:
a housing having a substantially cylindrical wall with an inner surface and an outer surface and at least one vent groove extending into the inner surface of the wall;
an explosive material having at least a first explosive surface and a second explosive surface; and
a liner having at least a first liner surface and a first liner rim;
at least one backer plate with an at least one backer plate rim;

wherein the first liner surface is adjacent to the first explosive surface, the second explosive surface is adjacent to the at least one backer plate, and the liner rim is adjacent to the wall.

2. The assembly according to claim 1 , wherein a plurality of vent grooves are located extending into the inner surface of the wall.

3. The assembly according to claim 1 , wherein the at least one vent groove has an upper portion above the liner rim and a lower portion below the liner rim.

4. The assembly according to claim 3 , wherein the at least one vent groove is adapted to allow venting of gases around the liner.

5. The assembly according to claim 4 , wherein the at least one vent groove is a plurality of grooves spaced substantially equally apart on the inner surface of the wall.

6. The assembly according to claim 3 , wherein the at least one vent groove is adapted to allow venting of gases around the at least one backer plate.

7. The assembly according to claim 3 , wherein the at least one vent groove is adapted to allow venting of gases around the at least one backer plate and the at least one liner.

8. The assembly according to claim 1 , wherein the at least one vent groove is positioned and arranged to provide venting of gases around the liner.

9. The assembly according to claim 1 , wherein the at least one vent groove is adapted to substantially equalize pressure across the inner surface of the wall.

10. The assembly according to claim 9 , wherein the at least one vent groove is a longitudinal trench along the length of the inner surface of the wall adjacent to the liner rim.

11. The assembly according to claim 1 , wherein the backer plate has at least one vent.

12. The assembly according to claim 11 , wherein the at least one vent is at least one hole.

13. The assembly according to claim 11 , wherein the at least one vent is at least one notch.

14. A jet cutter housing adapted to contain explosive material and a liner comprising:
a closed rigid cross section revolved around a center axis with an inner surface parallel to the center axis;
at least one backer plate with an at least one backer plate rim;
the liner having a liner rim; and
at least one vent groove extending into the inner surface parallel to the center axis;
wherein the at least one vent groove is adapted to vent gases from deflagration of the explosive material.

15. The apparatus according to claim 14 , wherein the at least one vent groove is positioned and arranged to provide venting of gases around the liner.

16. The assembly according to claim 14 , wherein the at least one vent groove is adapted to allow venting of gases around the at least one backer plate.

17. The assembly according to claim 14 , wherein the at least one vent groove is adapted to allow venting of gases around at least one backer plate and the at least one liner.

18. The apparatus according to claim 15 , wherein the at least one vent groove is a plurality of vent grooves positioned and arranged about the center axis.

19. The assembly according to claim 14 , wherein the at least one vent groove is adapted to substantially equalize pressure across the inner surface.

20. The assembly according to claim 19 , wherein the at least one vent groove is a longitudinal trench along the length of the inner surface adjacent to the liner rim.

21. A jet cutter housing adapted to contain an explosive material and a liner comprising:
a substantially cylindrical portion with an inner wall; and
at least one vent groove extending into the inner wall of the cylindrical portion.

22. The apparatus according to claim 21 , wherein the at least one vent groove is positioned and arranged to provide a path for gases to vent around the liner.

23. The apparatus according to claim 22 , wherein the at least one vent groove is a plurality of vent grooves positioned and arranged about the center axis.

24. The apparatus according to claim 21 , wherein the at least one vent groove is adapted to substantially equalize pressure across the inner wall.

25. A jet cutter assembly comprising;
a first liner having a first liner rim;
a second liner having a second liner rim;
a first backer plate having a first backer plate rim;
a second backer plate having a second backer plate rim;
a first explosive element retained between the first liner and the first backer plate;
a second explosive element retained between the second liner and the second backer plate;
a substantially cylindrical housing having a first inner surface and a second inner surface offset axially, wherein the housing is adapted to contain the first liner, the second liner, the first explosive element, the second explosive element, the first backer plate, and the second backer plate;
a plurality of first longitudinal vent grooves extending into the first inner surface adapted to provide pressure venting around the first liner and first backer plate; and
a plurality of second longitudinal vent grooves extending into the second inner surface adapted to provide pressure venting around the second liner and second backer plate.

26. The assembly according to claim 25 , wherein the first backer plate is adapted for venting.

27. The assembly according to claim 25 , wherein the second backer plate is adapted for venting.

28. The assembly according to claim 26 , wherein the first backer plate has at least one notch in the first backer plate rim.

29. The assembly according to claim 27 , wherein the second backer plate has at least one notch in the second backer plate rim.

30. The assembly according to claim 25 , wherein the first backer plate has a plurality of notches in the first backer plate rim adapted for venting and the second backer plate has a plurality of notches in the second backer plate rim adapted for venting.

31. The assembly according to claim 25 , wherein the first backer plate has a plurality of holes adapted for venting and the second backer plate has a plurality of holes adapted for venting.

32. The assembly according to claim 25 , wherein the first backer plate has at least one hole and at least one notch adapted for venting and the second backer plate has at least one hole and at least one notch adapted for venting.

Assignees

• Hunting Titan Inc

Inventors

• Collins William Richard
• Rudnik Ian Douglas
• Pederson Mark Allan

Classifications

• F42D5/00

  Safety arrangements · CPC title

• E21B29/02

  by explosives or by thermal or chemical means {(freeing stuck objects by explosives E21B31/002)} · CPC title

• F42D1/00

  Blasting methods or apparatus, e.g. loading or tamping · CPC title

• F42B1/02 Primary

  Shaped or hollow charges (blasting cartridges with cavities in the charge F42B3/08; oil winning using shaped-charge perforators E21B43/116) · CPC title