Gas generator

• US 8,616,128 B2
• Filed: 10/06/2011
• Issued: 12/31/2013
• Est. Priority Date: 10/06/2011
• Status: Active Grant

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Alliant Techsystems Incorporated (Northrop Grumman Corporation)
• Inventors: Sampson, William P.
• Primary Examiner(s): Clement, Michelle (Shelley)
• Assistant Examiner(s): COOPER, JOHN
• Application Number:
  US13/267,410
• Publication Number:
  US 20130087064A1
• Time in Patent Office: 817 Days
• Field of Search: 102/367, 102/368, 102/369, 102/370, 169/5, 169/46
• US Class Current: 102/367
• CPC Class Codes: B01J 15/00 Chemical processes in general for reacting gaseous media with non-particulate solids, e.g. sheet material; Apparatus specially adapted therefor B01J19/08 takes precedence
• CPC Class Codes: B01J 7/00 Apparatus for generating gases production of inert gas mixtures B01J19/14; for generating specific gases, see the relevant subclasses, e.g. C01B, C10J ; in "air bags" on vehicles B60R21/26; for starter gas F02C7/26; blasting cartridges for producing gas under pressure F42B3/04

Abstract

A gas generator assembly and method of operation. A plurality of stacks of laterally adjacent and laterally and axially supported gas generant wafers are contained within a housing. An igniter material is placed between the wafer stacks and an initiator. Upon ignition of the igniter material by the initiator, the wafer stacks are ignited and combust, generating a gas which, when reaching sufficient pressure within the housing in excess of ambient exterior pressures, opens a closed exhaust gas port and is released into a gas discharge structure where the gas passes through a heat sink material, cooling the gas before it exits the gas discharge structure for an intended use.

Claims

1. A gas generator assembly, comprising:

a gas generator including;

a substantially cylindrical housing containing;

a plurality of laterally adjacent and laterally and axially supported stacks of substantially cylindrical gas generant wafers located within a chamber within the housing in spaced relationship to and free from contact with structure of a side wall of the housing, at least some of the plurality of laterally adjacent gas generant wafer stacks being;

laterally supported by lateral support structure extending axially along a length of a respective stack and located inwardly of the side wall of the housing, substantially contacting the respective stack on at least a part of a circumference thereof and supporting each stack against rotational movement within the housing; and

axially supported at opposing ends by axial support structure contacting gas generant wafers of the respective stack;

the gas generant wafers of the stacks formulated and of sufficient mass in combination to, upon ignition, generate a gas within the chamber of a pressure in excess of ambient; and

igniter material adjacent each of the plurality of laterally adjacent stacks adjacent one end of the housing; and

an initiator operably associated with the igniter material and communicable with an exterior of the housing;

the substantially cylindrical housing comprising at least one closed gas exhaust port in communication with the chamber adjacent an opposing end of the plurality of laterally adjacent stacks, the at least one closed gas exhaust port configured to open to release the gas to an exterior of the substantially cylindrical housing in response to substantially a predetermined pressure within the chamber above ambient pressure.

2. The gas generator assembly of claim 1, further comprising a gas discharge structure into which the at least one gas exhaust port communicates when open.

3. The gas generator assembly of claim 2, wherein the gas discharge structure further comprises a substantially tubular housing including a heat sink chamber containing a heat sink material providing passages for gas from the at least one gas exhaust port therethrough.

4. The gas generator assembly of claim 3, wherein the heat sink material comprises steel shot.

5. The gas generator assembly of claim 4, wherein the steel shot is contained between two axially separated perforated supports within the substantially tubular housing.

6. The gas generator assembly of claim 5, wherein a position of at least one of the perforated supports is axially adjustable within the tubular housing.

7. The gas generator assembly of claim 1, wherein the axial support structure comprises spiders disposed adjacent opposing ends of the plurality of laterally adjacent stacks, the lateral support structure comprises a cage laterally surrounding the plurality of laterally adjacent stacks, and a retainer ring adjacent one of the spiders on a side thereof opposing the plurality of laterally adjacent stacks.

8. The gas generator assembly of claim 7, wherein

each spider comprises a plurality of radially extending legs secured to a ring intermediate ends of the legs, inner ends of the legs surrounding a central opening and outer ends of the legs defining a diameter slightly smaller than an inner diameter of the housing, one spider adjacent one end of the housing;

the cage comprising a plurality of axially spaced support rings having a plurality of axially oriented, circumferentially spaced support segments secured thereto, the support rings being axially spaced from ends of the support segments; and

the retainer ring disposed between the one of the spiders and adjacent an opposing end of the housing.

9. The gas generator assembly of claim 1, wherein the gas generant wafers are of cylindrical shape.

10. The gas generator assembly of claim 9, wherein the gas generant wafers further comprise an axial, central aperture.

11. The gas generator assembly of claim 1, wherein the gas generant wafers comprise an HACN composition.

12. The gas generator assembly of claim 1, wherein the plurality of laterally adjacent gas generant wafer stacks comprises seven gas generant wafer stacks.

13. The gas generator assembly of claim 1, wherein at least some of the plurality of laterally adjacent gas generant wafer stacks are arranged circumferentially within the chamber.

14. The gas generator assembly of claim 1, further comprising a frangible barrier closing the at least one closed gas exhaust port, the frangible barrier structured to fail and open the at least one closed gas exhaust port in response to substantially the predetermined pressure within the chamber above ambient pressure.

15. The gas generator of claim 1, further comprising a changeable orifice plate having a bore diameter less than a bore diameter of the at least one gas exhaust port secured in alignment with the at least one gas exhaust port.