Gas generating system

• US 7,343,862 B2
• Filed: 05/26/2005
• Issued: 03/18/2008
• Est. Priority Date: 05/27/2004
• Status: Expired due to Fees

• Current Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Automotive Systems Laboratory, Incorporated (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: McCormick, David M.
• Primary Examiner(s): Bergin; James S
• Application Number:
  US11/138,226
• Publication Number:
  US 20050280252A1
• Time in Patent Office: 1,027 Days
• Field of Search: 102/530, 102/531, 280/736, 280/741, 280/742, 280/737, 280/740
• US Class Current: 102/530
• CPC Class Codes: B60R 2021/2648 comprising a plurality of combustion chambers or sub-chambers
• CPC Class Codes: B60R 21/261 with means other than bag structure to diffuse or guide inflation fluid
• CPC Class Codes: B60R 21/2644 using only solid reacting substances, e.g. pellets, powder
• CPC Class Codes: B60R 21/274 characterised by means to rupture or open the fluid source

Abstract

A gas generating system (10) including a baffle system for cooling a gas generated by the gas generating system. The baffle system (40) includes a first enclosure and a second enclosure (80) spaced apart from a wall (14) of the first enclosure to define a first fluid flow passage (86) extending between the second enclosure (80) and the wall (14). The second enclosure (80) defines a baffle chamber (92) therein. The second enclosure (80) also includes at least one opening (94) for enabling fluid communication between a gas source and the second enclosure baffle chamber (92), and at least one opening (96) for enabling fluid communication between the second enclosure baffle chamber (92) and the first fluid flow passage (86). A third enclosure (32) is also provided spaced apart from the wall (14) of the first enclosure to define a second fluid flow passage (98) extending between the third enclosure (32) and the wall (14). The second fluid flow passage (98) is in fluid communication with the first fluid flow passage (86). The third enclosure (32) defines a baffle chamber (102) therein, and also includes at least one opening (104) for enabling fluid communication between the second fluid flow passage (98) and the third enclosure baffle chamber (102), and at least one opening (106) for enabling fluid communication between the third enclosure baffle chamber (102) and an exterior of the gas generating system. A method for cooling gases is also disclosed.

Claims

1. A gas generating system comprising:

a baffle system for cooling a gas generated by the gas generating system, the baffle system including;

a first enclosure;

a second enclosure spaced apart from a wall of the first enclosure to define a first fluid flow passage between the second enclosure and the wall, the second enclosure defining a baffle chamber therein, the second enclosure including at least one first opening for enabling fluid communication between a gas source and the second enclosure baffle chamber, and at least one second opening for enabling fluid communication between the second enclosure baffle chamber and the first fluid flow passage; and

a third enclosure spaced apart from the wall of the first enclosure to define a second fluid flow passage between the third enclosure and the wall, the second fluid flow passage being in fluid communication with the first fluid flow passage, the third enclosure defining a baffle chamber therein, the third enclosure including at least one first opening for enabling fluid communication between the second fluid flow passage and the third enclosure baffle chamber, and at least one second opening for enabling fluid communication between the third enclosure baffle chamber and an exterior of the gas generating system,

wherein all generated gas flowing to the exterior of the gas generating system is directed through the third enclosure baffle chamber.

2. The gas generating system of claim 1 further comprising a rupturable, fluid-tight seal positioned to seal the at least one second enclosure first opening.

3. The gas generating system of claim 1 further comprising a rupturable, fluid-tight seal positioned to seal the at least one third enclosure second opening.

4. The gas generating system of claim 1 wherein the third enclosure is positioned adjacent the second enclosure.

5. The gas generating system of claim 1 wherein the second enclosure and the third enclosure from a single structure.

6. The gas generating system of claim 1 wherein the third enclosure abuts the second enclosure.

7. The gas generating system of claim 1 wherein the second fluid flow passage is contiguous with the first fluid flow passage.

8. The gas generating system of claim 1 wherein the gas source is a gas generant combustion chamber and the gas generating system further includes a barrier separating the second enclosure baffle chamber from the combustion chamber.

9. The gas generating system of claim 1 wherein the gas source is a gas generant combustion chamber and the gas generating system further includes a barrier separating the first fluid flow passage from the combustion chamber.

10. The gas generating system of claim 1 wherein the third enclosure is positioned adjacent the second enclosure along a longitudinal dimension of the gas generating system.

11. The gas generating system of claim 1 further comprising a gas generant composition and a barrier separating the first fluid flow passage from the gas generant composition.

12. The gas generating system of claim 11 wherein the gas generant composition is a smokeless gas generant composition.

13. The gas generating system of claim 1 further comprising a fourth enclosure spaced apart from a wall of the first enclosure to define a third fluid flow passage between the fourth enclosure and the wall, the fourth enclosure defining a baffle chamber therein, the fourth enclosure including at least one opening for enabling fluid communication between the third enclosure baffle chamber and the fourth enclosure baffle chamber;

and

at least one opening for enabling fluid communication between the fourth enclosure baffle chamber and the third fluid flow passage,

wherein the third fluid flow passage is not in fluid communication with the second fluid flow passage, and the third fluid flow passage is in fluid communication with the exterior of the gas generating system.

14. The gas generating system of claim 13 further comprising a fifth enclosure spaced apart from a wall of the first enclosure to define a fourth fluid flow passage between the fifth enclosure and the wall, the fourth fluid flow passage being in fluid communication with the third fluid flow passage, the fifth enclosure defining a baffle chamber therein, the fifth enclosure including at least one opening for enabling fluid communication between the fourth fluid flow passage and the fifth enclosure baffle chamber, and

at least one opening for enabling fluid communication between the fifth enclosure baffle chamber and the exterior of the gas generating system.

15. The gas generating system of claim 14 wherein the fourth fluid flow passage is contiguous with the third fluid flow passage.

16. The gas generating system of claim 1 further comprising:

a gas generant composition;

an ignition source for igniting the gas generant composition upon activation of the gas generating system; and

a barrier positioned between the gas generant composition and the ignition source, the barrier including an orifice to enable fluid communication between the ignition source and the gas generant composition, the orifice defining a Venturi tube.