JP5014751B2 - Gas generator - Google Patents

Description

  The present invention relates to a gas generator suitable for use in a vehicle airbag system.

In a gas generator used in a vehicle airbag system, a filter is used for cooling a hot gas generated by combustion of a gas generating agent and capturing a residue. However, the filter is one of the most expensive parts among the parts of the gas generator, and it is desirable to reduce the amount of use of the filter in order to reduce the cost. In order to solve such a problem, conventionally, attempts have been made to lower the combustion temperature of the gas generating agent (Patent Document 1) and attempts to devise the structure of the inflator module (Patent Document 5).
WO2003 / 016244 Japanese Patent Laid-Open No. 2005-199867 JP 2005-178599 A US2005 / 0082804A USP 6,126,197

  In the present invention, by interposing at least a partition plate having a cooling function between the gas generating agent molded bodies used as a gas generating source, and exhibiting a high cooling function, can the amount of use of the filter be significantly reduced, Alternatively, it is an object of the present invention to provide a gas generator that can eliminate the filter itself and does not damage the airbag even in that case.

[Claim 1]
As a means for solving the problems, the present invention
A gas generator having an ignition means chamber disposed in a housing having a gas discharge port, a combustion chamber filled with a gas generant molding around the ignition means chamber, and having no coolant filter. ,
The ignition means chamber is separated from the combustion chamber by a cylindrical member having a through-hole in the peripheral surface, and a transfer charge and an igniter are disposed in the cylindrical member,
A cylindrical first partition member having a hole disposed so that the combustion chamber faces a through hole of the ignition means chamber, and a cylinder having a hole disposed outside the first partition member Is divided into two spaces by a second partition member,
Each of the two spaces is filled with a gas generating agent molded body, and only the gas generating agent molded body filled in one space faces the through hole,
Provided is a gas generator in which the first partition member and the second partition member have at least a cooling function.

  In the ignition means chamber, an outer shell is formed by a cylindrical member and an inner wall surface of the housing, and a known transfer charge and an electric igniter are accommodated therein. The peripheral surface of the cylindrical member is provided with a plurality of through holes closed with aluminum tape or the like as necessary, and when the igniter is activated, flames, high-temperature gas, shock waves, etc. are ejected from the through holes, The gas generant molded body is ignited and burned.

  The combustion chamber is a space formed by the inner wall surface of the housing and the outer wall surface of the ignition means chamber (cylindrical member), and is divided into two spaces by the cylindrical first partition member and the cylindrical second partition plate, Each space is filled with a gas generant molding.

  The gas generant molded body may be a cylindrical shape, a disk shape, a cylindrical shape or a disk shape having one or more through holes, a cylindrical shape or a disk shape having one or more depressions, etc. A large number of these can be filled.

  Further, as the gas generating agent molded body, two gas generating agent molded bodies having the same shape as the two space shapes described above can be used.

  The gas generator of the present invention does not have a coolant filter. The coolant filter is a filter that cools and filters the high-temperature gas generated by the combustion of the gas generant molded body, but is composed of a wire mesh laminate, a metal wire wound, a plain weave, a knit mesh, etc. For example, JP-A-10-119705, JP-A-2001-225715, JP-A-2001-225712, JP-A-2001-26250, JP-A-2001-315611, JP-A-2005-193138 No. 5, JP-A-2005-193762, and the like.

  Although the 1st partition member and 2nd partition member which are used by this invention have a cooling function at least, a form differs clearly from a well-known coolant filter. As a 1st partition member and a 2nd partition member, it consists of a plate material made from stainless steel, iron, or aluminum with a thickness of about 0.5 to 1.0 mm, and has a plurality of holes for allowing gas to pass through. be able to. The first partition member and the second partition member may be the same or different.

  In order to smoothly discharge the gas from the gas discharge port, a gap is preferably provided between the outer surface of the second partition member and the inner surface of the housing having the gas discharge port.

  By arranging the first and second partition members in this manner, the cooling effect can be greatly improved compared to the case where a known coolant filter having the same mass as the total mass of the used partition members is used. The partition member may have a function of filtering combustion gas in addition to a cooling function.

[Claim 2]
The present invention provides other means for solving the problems,
A gas generator having an ignition means chamber disposed in a housing having a gas discharge port, a combustion chamber filled with a gas generant molding around the ignition means chamber, and having no coolant filter. ,
The ignition means chamber is separated from the combustion chamber by a cylindrical member having a through-hole in the peripheral surface, and a transfer charge and an igniter are disposed in the cylindrical member,
An annular first partition member having a hole, which is disposed in the radial direction, and a cylindrical first member having a hole, which is disposed in the axial direction so as to be in contact with the outer peripheral edge of the first partition member. It is divided into two spaces by two partition members,
Each of the two spaces is filled with a gas generating agent molded body, and only the gas generating agent molded body filled in one space faces the through hole,
Provided is a gas generator in which the first partition member and the second partition member have at least a cooling function.

  In the ignition means chamber, an outer shell is formed by a cylindrical member and an inner wall surface of the housing, and a known transfer charge and an electric igniter are accommodated therein. The peripheral surface of the cylindrical member is provided with a plurality of through holes closed with aluminum tape or the like as necessary, and when the igniter is activated, flames, high-temperature gas, shock waves, etc. are ejected from the through holes, The gas generant molded body is ignited and burned.

  The combustion chamber is a space formed by the inner wall surface of the housing and the outer wall surface of the ignition means chamber (cylindrical member), and is divided into two spaces by an annular first partition member and a cylindrical second partition plate, The gas generating agent molded body is filled in the space. The same thing as the above can be used for a cyclic | annular 1st partition member and a cylindrical 2nd partition plate.

  The gas generant molded body may be a cylindrical shape, a disk shape, a cylindrical shape or a disk shape having one or more through holes, a cylindrical shape or a disk shape having one or more depressions, etc. A large number of these can be filled.

  Further, as the gas generating agent molded body, two gas generating agent molded bodies having the same shape as the two space shapes described above can be used.

  In order to smoothly discharge the gas from the gas discharge port, a gap is preferably provided between the outer surface of the second partition member and the inner surface of the housing having the gas discharge port.

  By arranging the first and second partition members in this manner, the cooling effect can be greatly improved compared to the case where a known coolant filter having the same mass as the total mass of the used partition members is used. The partition member may have a function of filtering combustion gas in addition to a cooling function.

[Claim 3]
In another aspect of the present invention, the gas generating agent molded body has the highest combustion temperature when it is located closest to the through hole of the ignition means chamber, and burns away from the through hole. The gas generator according to claim 1 or 2, wherein the temperature is lowered.

  In the present invention, the combustion temperature is based on a known theoretical calculation. The higher the combustion temperature, the better the ignitability, and the lower the combustion temperature, the worse the ignitability.

  In this way, due to the synergistic effect of the first and second partition members having the cooling function, the combustion temperature (ignitability) of the gas generant molded body is moved away from the side closer to the through hole of the ignition means chamber. By gradually lowering (i.e., from the early ignition order to the late ignition order), the overall combustion temperature can be reduced without reducing the overall ignitability.

[Claim 4]
The present invention provides the gas generator according to any one of claims 1 to 3, wherein the temperature range of the gas discharged from the gas generator is in the range of 500 to 1500 ° C as another means for solving the problem. .

  By using the first and second partition members having at least a cooling function, the temperature of the exhaust gas discharged from the gas generator can be maintained in a low range, so the amount of the coolant filter for cooling the exhaust gas is reduced. Or a coolant filter can be dispensed with.

[Claim 5]
As another means for solving the problem, the present invention provides a gas generating agent molded body closest to the through hole containing nitroguanidine and an oxidizing agent, and a gas generating agent molded body farthest from the through hole is guanidine. The gas generator in any one of Claims 1-4 which contains a nitrate and an oxidizing agent is provided.

  By combining a combination with a higher combustion temperature (nitroguanidine) and a lower combustion temperature (guanidine nitrate), the overall combustion temperature can be reduced without reducing the overall ignitability. it can. Other combinations of higher and lower combustion temperatures include nitroguanidine (combustion temperature higher than melamine) and melamine, guanidine nitrate (combustion temperature higher than melamine) and melamine. It can also be used.

  Since the gas generator of the present invention has two partition members having a cooling function, the cooling effect is high, so that the amount of use of the filter can be greatly reduced or the filter itself can be made unnecessary. Even in that case, the airbag is not damaged and the safety is high.

(1) Gas generator of FIG. 1 The gas generator of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a gas generator 10 of the present invention.

  The housing 13 is obtained by welding and integrating a closure shell 11 and a diffuser shell 12 at the flange portions 11a and 12a. The diffuser shell 12 has a plurality of gas discharge ports 15 on the peripheral surface, and the gas discharge ports 15 are closed from the inside by a moisture-proof aluminum tape 16.

  A cylindrical member 20 is disposed at the center of the housing 13 with both ends in contact with the inner surface of the closure shell 11 (the bottom surface of the housing 13) and the inner surface of the diffuser shell 12 (the ceiling surface of the housing 13). The interior is an ignition means chamber 21. The upper end side opening of the cylindrical member 20 is welded and fixed to the ceiling surface of the housing 13, and the lower end side opening is welded and fixed to a portion where the bottom surface of the housing 13 is bent inward.

  A plurality of through holes 22 are provided on the circumferential surface of the cylindrical member 20 at different height positions. In the ignition means chamber 21, a transfer charge 23 filled in an aluminum cup and a known electric igniter 24 are accommodated. The transfer agent 23 may be anything that can ignite and combust the first gas generant molded body 31.

  A space surrounded by the housing 13 and the cylindrical member 20 (ignition means chamber 21) is a combustion chamber. In the combustion chamber, a cylindrical first partition member 35 is disposed outside the cylindrical member 20 in the radial direction, and a cylindrical second partition member 36 is disposed further outside. The first partition member 35 and the second partition member 36 are formed with inward flange-like portions 35 b and 36 b, and the flange-like portions 35 b and 36 b are in contact with the ceiling surface of the housing 13.

  Further, a retainer 37 for adjusting the volume of the combustion chamber according to the amount of the gas generant molded body to be filled is disposed in the combustion chamber.

  The first partition member 35 is made of an iron plate having a thickness of 0.8 mm, and has a number of first gas holes 35a for allowing gas to pass therethrough.

  The second partition member 36 is made of an iron plate material having a thickness of 0.8 mm, and has a number of second gas holes 36a for allowing gas to pass therethrough.

  A large number of first gas generating agent molded bodies 31 are filled in a space surrounded by the tubular member 20, the first partition member 35, and the housing 13. The first gas generant molded body 31 faces the through hole 22.

  A large number of second gas generating agent molded bodies 32 are filled in a space surrounded by the first partition member 35, the second partition member 36, and the housing 13. The second gas generant molded body 32 does not face the through hole 22.

  The height of the through hole 22 of the cylindrical member 20 (for example, provided near the ceiling surface of the housing 13), the height of the first gas hole 35a of the first partition member 35 (for example, on the bottom surface of the housing 13). (Provided near the bottom surface of the housing 13) and the second gas hole 36a of the second partition member 36. By changing the height (for example, provided at a position close to the ceiling surface of the housing 13), the high temperature gas flow and the first gas generant molded body 31 are made to flow while changing the direction up and down. In addition, the second gas generating agent molded body 32 can be easily contacted.

  A gap 38 is provided between the second partition member 36 and the peripheral surface of the housing 13 (the surface having the gas exhaust port 15) so that gas can be smoothly discharged.

  The first gas generant molded body 31 contains nitroguanidine as a fuel, strontium nitrate as an oxidant, and further contains a known binder and various known additives as required. The combustion temperature is adjusted to be in the range of 2000 to 2500 ° C.

  The second gas generant molded body 32 contains guanidine nitrate as a fuel, basic copper nitrate as an oxidizer, and further contains a known binder and various known additives as required. is there. The combustion temperature is adjusted to be in the range of 1000 to 1500 ° C.

(Composition example of the first gas generating agent molding 31)
Fuel: Nitroguanidine 35% by mass
Oxidizing agent: 50% by mass of strontium nitrate
Binder: Carboxymethylcellulose sodium salt 10% by mass
Additive: Acid clay 5% by mass
Combustion temperature: 2100 ° C
(Example of composition of second gas generant molded body 32)
Fuel: Guanidine nitrate 41.3% by mass
Oxidizing agent: basic copper nitrate 48.7% by mass
Binder: Carboxymethylcellulose sodium salt 5% by mass
Additive: Aluminum hydroxide 5 mass%
Combustion temperature: 1400 ° C
Next, the operation when the gas generator 10 is incorporated into an automobile airbag system will be described with reference to FIG.

  When the automobile collides and receives an impact, the transfer charge 23 is ignited and combusted by a flame or the like generated by the operation signal from the control unit and the igniter 24 in the ignition means chamber 21 being operated and ignited. From 22, flames and high-temperature gas are discharged.

  The first gas generating agent molded body 31 with good ignitability is ignited and burned by the flame discharged from the through-hole 22 or high-temperature gas to generate high-temperature gas.

  The high temperature gas generated from the first gas generant molded body 31 is cooled by contact with the first partition member 35, and contacts the gas generant molded body 32 through the first gas hole 35a to be ignited and burned. Generate hot gas.

  The gas generated by burning the first gas generant molded body 31 reaches the second partition member 36 while igniting and burning the second gas generant molded body 32. And it cools by contacting with the 2nd partition member 36, flows into the gap | interval 38 through the 2nd gas hole 36a, destroys the aluminum tape 16, is discharged | emitted from the gas exhaust port 15, and inflates an airbag. .

  As described above, in the gas generator 10, the gas generated by burning the first gas generant molded body 31 (gas having a high combustion temperature) was cooled twice by the first partition member 35 and the second partition member 36. Later, the gas is discharged from the gas outlet 15. The gas (gas having a low combustion temperature) generated by burning the second gas generant molded body 32 is cooled by the second partition member 36 and then discharged from the gas discharge port 15. For this reason, the exhaust gas temperature discharged | emitted from the gas discharge port 15 can be reduced to the range of 500-1500 degreeC.

  When the first gas generant molded body 31 and the second gas generant molded body 32 having different ignitability (combustion temperature) are used in combination, the gas exhaust port 15 discharges while maintaining good ignitability as a whole. The temperature range of the generated gas can be maintained in a low range.

(2) Gas Generator of FIG. 2 FIG. 2 is a longitudinal sectional view of the gas generator 100 of the present invention. Since the gas generator 100 of FIG. 2 has the same structure as that of the gas generator 10 of FIG. 2, the same reference numerals as those in FIG. 1 mean the same elements as those in FIG.

  In the combustion chamber, a cylindrical first gas generating agent molded body 131 and a cylindrical second gas generating agent molded body 132 are arranged in the radial direction.

  The first gas generating agent molded body 131 is disposed such that the inner peripheral surface thereof faces all of the plurality of through holes 22 of the cylindrical member 20 and is in contact with the outer surface of the cylindrical member 20. The lower end surface of the first gas generant molded body 131 is in contact with the inner surface of the closure shell 11 (the bottom surface of the housing 13), and the upper end surface is the inner surface of the diffuser shell 12 (the ceiling surface of the housing 13). A gap 131a is formed as a gas flow path.

  The inner peripheral surface of the second gas generant molded body 132 is disposed in contact with the outer peripheral surface of the first gas generant molded body 131. The lower end surface of the second gas generant molding 132 is in contact with the inner surface of the closure shell 11 (the bottom surface of the housing 13), and the upper end surface is the inner surface of the diffuser shell 12 (the ceiling surface of the housing 13). A gap 132a is formed as a gas flow path.

  The first gas generant molded body 131 and the second gas generant molded body 132 have the same composition as the first gas generant molded body 31 and the second gas generant molded body 32 used in the gas generator 10 of FIG. Things can be used.

(3) Gas Generator of FIG. 3 FIG. 3 is a longitudinal sectional view of the gas generator 200 of the present invention. Since the gas generator 200 of FIG. 3 has the same structure as the gas generator 10 of FIG. 1 except that the shape and arrangement of the partition members are different, only different components will be described. 3, the same reference numerals as those in FIG. 1 mean the same elements as those in FIG.

  A space surrounded by the housing 13 and the cylindrical member 20 (ignition means chamber 21) is a combustion chamber. An annular first partition member 235 is disposed in the combustion chamber so as to partition the interior vertically, and a cylindrical second partition member 236 is disposed on the outer side. The second partition member 236 is formed with an inward flange-shaped portion 236 b, and the flange-shaped portion 236 b is in contact with the ceiling surface of the housing 13. Further, a retainer 237 for adjusting the volume of the combustion chamber according to the amount of the gas generant molded body to be filled is disposed in the combustion chamber.

  The first partition member 235 is made of an iron plate having a thickness of 0.8 mm, and has a number of first gas holes 235a for allowing gas to pass therethrough.

  The second partition member 236 is made of an iron plate having a thickness of 0.8 mm, and has a number of second gas holes 236a for allowing gas to pass therethrough.

  A large number of first gas generating agent molded bodies 231 are filled in a space surrounded by the tubular member 20, the first partition member 235, the second partition member 236, and the diffuser shell 12. The first gas generant molded body 231 faces the through hole 22. The first partition member 235 has a plurality of first gas holes 235a.

  A large number of second gas generating agent molded bodies 232 are filled in a space surrounded by the tubular member 20, the first partition member 235, the second partition member 236, and the closure shell 11. The second gas generant molded body 232 does not face the through hole 22. The second partition member 236 has a plurality of second gas holes 236a.

  A gap 38 is provided between the second partition member 236 and the peripheral surface of the housing 13 (the surface having the gas discharge port 15) so that gas can be smoothly discharged.

  The first gas generant molded body 231 and the second gas generant molded body 232 have the same composition as the first gas generant molded body 31 and the second gas generant molded body 32 used in the gas generator 10 of FIG. Things can be used.

  Next, FIG. 3 demonstrates operation | movement at the time of incorporating the gas generator 200 in the airbag system of a motor vehicle.

  When the automobile collides and receives an impact, the transfer charge 23 is ignited and combusted by a flame or the like generated by the operation signal from the control unit and the igniter 24 in the ignition means chamber 21 being operated and ignited. From 22, flames and high-temperature gas are discharged.

  The first gas generating agent molded body 231 having good ignitability is ignited and combusted by the flame discharged from the through-hole 22 or the high-temperature gas to generate a high-temperature gas.

  The high temperature gas generated from the first gas generant molded body 231 is cooled by coming into contact with the first partition member 235, contacts the second gas generant molded body 232 through the first gas hole 235a, and ignites. Burn and generate hot gas.

  The gas generated by the combustion of the first gas generant molded body 231 is cooled by contacting the second partition member 236 while igniting and burning the second gas generant molded body 232, and the second gas hole 236 a After cooling through, it flows into the gap 38, breaks the aluminum tape 16, is discharged from the gas discharge port 15, and inflates the airbag.

  Thereafter, the combustion gas generated from the second gas generant molded body 232 is cooled by coming into contact with the second partition member 236, flows into the gap 38 through the second gas hole 236 a, and is discharged from the gas discharge port 15. Then, the airbag is further inflated.

  As described above, in the gas generator 200, the gas generated by the combustion of the first gas generant molded body 231 (gas having a high combustion temperature) causes the first gas generant molded body 231 to ignite and burn, and also to the first partition. After being cooled twice by the member 235 and the second partition member 236, the gas is discharged from the gas discharge port 15. The gas generated by burning the second gas generant molded body 232 (gas having a low combustion temperature) is cooled by the second partition member 236 and then discharged from the gas discharge port 15. For this reason, the exhaust gas temperature discharged | emitted from the gas discharge port 15 can be reduced to the range of 500-1500 degreeC.

  When the first gas generant molded body 231 and the second gas generant molded body 232 having different ignitability (combustion temperature) are used in combination, the gas exhaust port 15 discharges while maintaining good ignitability as a whole. The temperature range of the generated gas can be maintained in a low range.

(4) Gas Generator of FIG. 4 FIG. 4 is a longitudinal sectional view of the gas generator 300 of the present invention. Since the gas generator 300 of FIG. 4 has the same structure as that of the gas generator 200 of FIG. 4, the same reference numerals as those in FIGS. 1 and 3 mean the same elements as those in FIGS.

  An annular first gas generant molded body 331 and an annular second gas generant molded body 332 are arranged vertically in the combustion chamber.

  The first gas generating agent molded body 331 is disposed so that the inner peripheral surface thereof faces all of the plurality of through holes 22 of the cylindrical member 20 and is in contact with the outer surface of the cylindrical member 20. The lower end surface of the first gas generating agent molded body 331 is in contact with the first partition member 235, and the upper end surface is in contact with the inner surface of the diffuser shell 12 (the ceiling surface of the housing 13).

  The inner peripheral surface of the second gas generant molded body 332 is disposed in contact with the outer peripheral surface of the cylindrical member 20 (surface without the through hole 22). The lower end surface of the second gas generant molded body 332 is in contact with the inner surface of the closure shell 11 (the bottom surface of the housing 13), and the upper end surface is in contact with the first partition member 235.

  The first gas generant molded body 331 and the second gas generant molded body 332 are the same as the first gas generant molded body 31 and the second gas generant molded body 32 used in the gas generator 10 of FIG. Can be used.

The longitudinal cross-sectional view of the gas generator of this invention. The longitudinal cross-sectional view of the gas generator of another embodiment of this invention. The longitudinal cross-sectional view of the gas generator of another embodiment of this invention. The longitudinal cross-sectional view of the gas generator of another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas generator 11 Closure shell 12 Diffuser shell 13 Housing 15 Gas discharge port 20 Cylindrical member 21 Ignition means chamber 23 Transfer agent 24 Igniter 31 1st gas generating agent molded body 32 2nd gas generating agent molded body 35 1st partition Member 36 Second partition member

Claims (5)

An ignition means chamber (21) is disposed in a housing (13) in which a diffuser shell (12) having a closure shell (11) and a gas discharge port (15) is welded and integrated at each flange portion (11a, 12a). A gas generator having a combustion chamber filled with a gas generant molding around the ignition means chamber (21), and having no coolant filter,
The ignition means chamber (21) is separated from the combustion chamber by a cylindrical member (20) having a through-hole (22) on the peripheral surface, and a transfer charge (23) and an ignition are placed in the cylindrical member (20). Container (24) is arranged,
A cylindrical first partition member (35) having a hole (35a) disposed so that the combustion chamber faces a through hole (22) of the ignition means chamber (21), and the first partition It is divided into two spaces by a cylindrical second partition member (36) having a hole (36a) disposed outside the member (35),
Filled with a first gas generant molded body (31) in a space surrounded by a cylindrical member (20) having a through hole (22) on the peripheral surface, a cylindrical first partition member (35) and a housing (13) And
The space surrounded by the cylindrical first partition member (35), the cylindrical second partition member (36) and the housing (13) is filled with the second gas generating agent molded body (32),
The first gas generant molded body (31) and the second gas generant molded body (32) are such that the combustion temperature of the first gas generant molded body (31) is the combustion temperature of the second gas generant molded body (32). Higher than
The gas generator, wherein the first partition member (35) and the second partition member (36) have at least a cooling function.   The gas generation according to claim 1, wherein the first gas generant molded body (31) contains nitroguanidine and an oxidizing agent, and the second gas generant molded body (32) contains guanidine nitrate and an oxidizing agent. vessel. An ignition means chamber (21) is disposed in a housing (13) in which a diffuser shell (12) having a closure shell (11) and a gas discharge port (15) is welded and integrated at each flange portion (11a, 12a). A gas generator having a combustion chamber filled with a gas generant molding around the ignition means chamber (21), and having no coolant filter,
The ignition means chamber (21) is separated from the combustion chamber by a cylindrical member (20) having a through-hole (22) on the peripheral surface, and a transfer charge (23) and an ignition are placed in the cylindrical member (20). Container (24) is arranged,
The combustion chamber is disposed in the axial direction so as to be in contact with an annular first partition member (235) having a hole (235a) disposed in the radial direction and an outer peripheral edge of the first partition member (235). Further, it is divided into two spaces by a cylindrical second partition member (236) having a hole (236a),
The space surrounded by the cylindrical member (20), the first partition member (235), the second partition member (236), and the diffuser shell (12) is filled with the first gas generant molded body (231), and the first The gas generant molding (231) faces the through hole (22),
A space surrounded by the cylindrical member (20), the first partition member (235), the second partition member (236), and the closure shell (11) is filled with the second gas generant molded body (232), and the second The gas generant molding (232) does not face the through hole (22),
The first gas generant molded body (231) and the second gas generant molded body ( 232 ) are such that the combustion temperature of the first gas generant molded body (231) is the combustion temperature of the second gas generant molded body (232). Higher than
The gas generator, wherein the first partition member (235) and the second partition member (236) have at least a cooling function. The first gas generating agent molded article (231) is containing an oxidizing agent and nitroguanidine, the second gas generating agent molded article (232) is one which contains the guanidine nitrate oxidizer claim 3 wherein the gas generating vessel.   The gas generator of any one of Claims 1-4 whose temperature range of the gas discharged | emitted from the gas generator is the range of 500-1500 degreeC.

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