Liquid-augmented, generated-gas fire suppression systems and related methods

• US 8,967,284 B2
• Filed: 10/06/2011
• Issued: 03/03/2015
• 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): Reis, Ryan
• Application Number:
  US13/267,427
• Publication Number:
  US 20130087348A1
• Time in Patent Office: 1,244 Days
• Field of Search: 169/9, 169/11, 169/12, 169/27, 169/35, 169/44, 169/46, 169/54, 169/70, 169/71, 169/72, 169/78, 169/84
• US Class Current: 169/44
• CPC Class Codes: A62C 13/22 with incendiary substances producing pressure gas
• CPC Class Codes: A62C 13/76 Details or accessories
• CPC Class Codes: A62C 35/023 the extinguishing material being expelled by compressed gas, taken from storage tanks, or by generating a pressure gas for foam generation A62C5/02
• CPC Class Codes: A62C 5/006 Extinguishants produced by combustion

Abstract

Fire suppression apparatuses include a housing with gas generant material disposed therein, an initiator for igniting the gas generant material, and a cooling system. The cooling system includes a first chamber with a coolant material disposed therein and a second chamber. The coolant material is caused to flow from the first chamber into the second chamber to cool gas formed by the ignition of the gas generant material upon exiting from the housing under pressure. The cooling system may further include a piston disposed within the first chamber and movable responsive to gas pressure. Methods for cooling a fire suppressant gas and methods for suppressing a fire include flowing a fire suppressant gas into first and second chambers of a cooling system, flowing a coolant material from the first chamber into the second chamber, and contacting the fire suppressant gas with the coolant material to cool the fire suppressant gas.

Claims

1. A fire suppression apparatus, comprising:

a housing having gas generant material disposed therein;

an initiator operatively associated with at least a portion of the gas generant material and configured to ignite at least a portion of the gas generant material to form gas upon actuation of the initiator; and

a cooling system disposed adjacent to the housing, the cooling system including a first housing defining a first chamber therein and a second housing defining a second chamber therein, the first housing and the second housing having respective first openings proximate the housing having a gas generant material disposed therein and respective second openings opposite the housing having a gas generant material disposed therein, the first chamber having a coolant material disposed therein, wherein upon actuation responsive to pressure of gas exiting the housing having the gas generant material disposed therein, at least a portion of the coolant material is caused to flow from the first chamber into the second chamber by a piston movably disposed within the first chamber, extending from an interior surface of the first housing to an exterior surface of the second housing, wherein the piston is movable relative to the first housing and the second housing, and responsive to the pressure of the gas exiting the housing having the gas generant material disposed therein,

wherein the housing having the gas generant material disposed therein, the first housing, and the second housing are configured to provide a substantially axial flow pathway for gas formed upon ignition of the gas generant material, the substantially axial flow pathway extending in a substantially axial direction from the housing having gas generant material disposed therein, in the substantially axial direction into the first housing of the cooling system through the first opening thereof and against the piston, in the substantially axial direction into the second housing of the cooling system through the first opening thereof, and in the substantially axial direction out of the second housing of the cooling system through the second opening of the second housing.

2. The fire suppression apparatus of claim 1, wherein the piston further comprises at least one seal disposed between the piston and the first housing and between the piston and the second housing to inhibit fluid flow between the piston and the interior surface of the first housing and exterior surface of the second housing.

3. The fire suppression apparatus of claim 1, wherein pressure produced by reaction of at least a portion of the gas generant material to form the gas serves to move the piston relative to the first housing and the second housing and flow at least a portion of the coolant material from the first chamber into the second chamber.

4. The fire suppression apparatus of claim 1, wherein the coolant material comprises at least one endothermically alterable material.

5. The fire suppression apparatus of claim 4, wherein the endothermically alterable material comprises a liquid that at least one of vaporizes and decomposes upon contact with the gas formed by ignition of the gas generant material.

6. The fire suppression apparatus of claim 5, wherein the endothermically alterable material forms additional gas products upon contact with the gas formed by the ignition of the gas generant material.

7. The fire suppression apparatus of claim 4, wherein the endothermically alterable material comprises water.

8. The fire suppression apparatus of claim 7, wherein the endothermically alterable material further comprises at least one of calcium chloride, propylene glycol, potassium acetate, and an alkali metal bicarbonate.

9. The fire suppression apparatus of claim 1, wherein the second opening of the first housing of the cooling system is configured to direct flow of the coolant material into the second chamber.

10. The fire suppression apparatus of claim 9, further comprising at least one additional opening into the first chamber for enabling pressure of the fire suppressant gas to force at least a portion of the coolant material to flow from the first chamber into the second chamber.

11. The fire suppression apparatus of claim 1, further comprising a structure disposed in the second chamber, the structure for increasing pressure of the gas exiting the housing to act on the coolant material.

12. The fire suppression apparatus of claim 11, wherein the structure comprises a plate having at least one opening therethrough.

13. The fire suppression apparatus of claim 1, wherein the first chamber is positioned laterally adjacent the second chamber.

14. The fire suppression apparatus of claim 1, wherein the first chamber at least partially laterally surrounds the second chamber.

20. The fire suppression apparatus of claim 1, wherein the second opening of the first housing of the cooling system comprises at least one opening positioned radially around the second chamber configured to direct flow of the coolant material into the second chamber.

15. A method for suppressing a fire with a fire suppression apparatus, the method comprising:

igniting a gas generant material in a gas generant housing to form a fire suppressant gas;

flowing the fire suppressant gas in a substantially axial direction from the gas generant housing into a first chamber defined by a first housing and into a second chamber defined by a second housing of a cooling system;

flowing a coolant material from the first chamber of the cooling system into the second chamber by forcing a piston to move in the first chamber in the substantially axial direction along and relative to an interior surface of the first housing and an exterior surface of the second housing responsive to pressure of the fire suppressant gas, the piston fully contained within the first chamber throughout movement thereof in the first chamber;

contacting the fire suppressant gas with the coolant material to cool the fire suppressant gas within the second housing; and

flowing the combination of the fire suppressant gas and the coolant material from the second housing in the substantially axial direction.

16. The method of claim 15, further comprising directing the combination of the fire suppressant gas and the coolant material toward a fire.

17. A method for cooling a fire suppressant gas, the method comprising:

flowing a fire suppressant gas in a substantially axial direction into a first opening of a first chamber defined by a first housing and a first opening of a second chamber defined by a second housing proximate the first chamber;

moving a piston disposed fully in the first chamber and extending from an interior surface of the first housing to an exterior surface of the second housing in the substantially axial direction and relative to the first housing and the second housing by applying pressure of the fire suppressant gas to the piston;

flowing a coolant material disposed in the first chamber from the first chamber into the second chamber responsive to movement of the piston;

contacting the fire suppressant gas with the coolant material in the second chamber to cool the fire suppressant gas;

flowing the fire suppressant gas from the first opening of the second housing through the second chamber in the substantially axial direction; and

flowing the combination of the fire suppressant gas and the coolant material from the second housing through a second opening of the second housing in the substantially axial direction.

18. The method of claim 17, further comprising igniting a gas generant material to form the fire suppressant gas.

19. The method of claim 17, wherein flowing a coolant material comprises flowing at least one of water, calcium chloride, propylene glycol, potassium acetate, an alkali metal bicarbonate, and combinations thereof.

21. A fire suppression apparatus, comprising:

a housing having gas generant material disposed therein;

an initiator operatively associated with at least a portion of the gas generant material and configured to ignite at least a portion of the gas generant material to form gas upon actuation of the initiator;

a cooling system disposed adjacent to the housing, the cooling system including a first housing defining a first chamber therein and a second housing defining a second chamber therein, the first chamber having a coolant material disposed therein, wherein upon actuation responsive to pressure of gas exiting the housing having the gas generant material disposed therein, at least a portion of the coolant material is caused to flow from the first chamber into the second chamber by a piston movably disposed within the first chamber, extending from an interior surface of the first housing to an exterior surface of the second housing and responsive to the pressure of the gas exiting the housing having the gas generant material disposed therein; and

at least one additional opening into the first chamber for enabling pressure of the fire suppressant gas to force at least a portion of the coolant material to flow from the first chamber into the second chamber.