Pyrotechnic type gas generator

Abstract

The utility model relates to a firework type gas generator which comprises a tube shell, an ignition mechanism, a medicine box, a gas production area, a gas transmission area, a gas guide area and a plugging plate are sequentially arranged in the tube shell, the ignition mechanism comprises an outer steel framework and a plastic support, and an O-shaped ring is arranged between the steel framework and the corresponding inner wall of the tube shell; the igniter and the short circuit clamp are arranged in the plastic support; the aluminum foil serves as the edge of the explosive box, and ignition powder is filled between the aluminum foil and the igniter. The rear edge of the aluminum foil is connected with the front end of the steel skeleton; a groove is formed in the position, corresponding to the connection position of the O-shaped ring and the aluminum foil, of the outer side wall of the steel framework; a filter barrel is arranged in the gas production area and concentric with the pipe shell, filter holes are evenly and densely distributed in the surface of the filter barrel, produced gas enters the filter barrel, and the front end of the filter barrel is open and sequentially communicated with the gas conveying area and the gas guide area.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas generators, and in particular relates to a pyrotechnic gas generator. Background Art

[0002] In the field of automobile airbags, when a car crashes, the airbag can be inflated in time to protect the driver and passengers from rigid collisions. The airbag inflation device is a gas generator. The traditional gas generator is a tube shell type with an ignition mechanism at one end. The gas-generating medicine in the tube shell is ignited to instantly generate a large amount of gas, which then rushes into the airbag.

[0003] Traditional ignition mechanisms generally use an integral steel support, with an ignition tool and a short-circuit clamp installed at both ends of the steel support. However, in order to fit the short-circuit assembly, the steel support is provided with many grooves, which makes processing complex and costly. In the actual processing process, iron filings are easily generated, which can easily cause the ignition tool to short-circuit, resulting in airbag failure during use, or even ignition failure. In addition, a metal foil is provided between the steel support and the tube shell, and the metal foil is deformed during the tightening or closing process to seal. However, in the tightening or closing process, a large external force is required to deform the metal foil, which can easily cause the steel support to deform, seriously affecting the assembly of the short-circuit assembly or the plug-in and unplugging of the connector. Utility Model Content

[0004] The technical problem to be solved by the utility model is that in the gas generator of the safety airbag, the steel support of the ignition mechanism is complex to process and has a high cost due to its own structural problems, and is prone to produce iron filings during use, thereby causing a short circuit in the ignition device; the steel support and the tube shell are sealed with metal foil, which easily causes the steel support to deform.

[0005] The utility model provides a pyrotechnic gas generator, comprising a cylindrical tube shell, wherein an ignition mechanism, a medicine box, a gas production area, a gas transmission area, a gas guide area and a blocking plate are sequentially arranged inside the tube shell along the axial direction of the tube shell, the ignition mechanism comprises an external steel frame and an internal plastic support, an O-ring is arranged between the steel frame and the corresponding inner wall of the tube shell for sealing; an ignition tool and a short-circuit clamp are fixed inside the plastic support;

[0006] The aluminum foil is used as the edge of the medicine box, and ignition powder is filled between the aluminum foil and the ignition device; the rear edge of the aluminum foil is connected to the front end of the steel frame; the steel frame is barrel-shaped, and the outer wall of the steel frame is provided with grooves at the positions corresponding to the O-ring and connected with the aluminum foil;

[0007] A filter barrel is provided in the gas production area. The filter barrel is concentrically arranged with the tube shell. The surface of the filter barrel is evenly and densely covered with filter holes, so that the gas generated in the gas production area enters the filter barrel through the filter holes. The front end of the filter barrel is open and connected to the gas transmission area and the gas guide area in sequence.

[0008] Optionally, the ignition mechanism is cylindrical and concentrically arranged with the tube shell, the ignition mechanism includes a steel frame, a plastic support, an ignition device and a short-circuit clamp, the plastic support, the ignition device and the steel frame are connected by injection molding; the outer wall of the steel frame and the inner wall of the tube shell are sealed by an O-ring; the plastic support includes a front barrel, a middle barrel and a rear barrel from front to back, the outer diameters of the middle barrel, the front barrel and the rear barrel increase successively, and the inner diameters of the middle barrel, the front barrel and the rear barrel also increase successively, the side walls of the steel frame surround the outside of the front barrel, the barrel bottom of the steel frame surrounds the outside of the middle barrel, and the outer wall of the rear barrel is close to the inner wall of the tube shell to play a sealing role.

[0009] Further optionally, the front barrel has horizontal side walls and a vertical bottom, the ignition device is installed inside the front barrel, the side walls of the front barrel surround the outside of the ignition device, and the rear end of the ignition device is close to the bottom of the front barrel, so that the front end of the ignition device faces the inside of the medicine box, thereby being able to ignite the ignition powder in the medicine box.

[0010] Further optionally, the middle barrel is a solid cylinder, the front end of the middle barrel is connected to the bottom of the front barrel as a whole, and the rear end of the middle barrel is connected to the top of the rear barrel as a whole.

[0011] Further optionally, the rear tub has horizontal side walls and a vertical tub top, the tub top of the rear tub is located at the front end thereof, and the short-circuit clip is installed inside the rear tub;

[0012] A plurality of through passages are provided on the top of the rear barrel, the middle barrel and the bottom of the front barrel, so that the circuit of the short-circuit clip can be connected to the ignition device in the front barrel through the through passages.

[0013] Further optionally, the outer surface of the horizontal side wall of the steel skeleton is provided with a circle of first grooves for arranging an O-ring, so that the O-ring is squeezed between the steel skeleton and the inner wall of the tube shell to achieve sealing;

[0014] A circle of second grooves is arranged at the front end of the outer surface of the side wall of the steel frame, which is used to clamp the rear edge of the aluminum foil, thereby fixing the aluminum foil and the medicine box.

[0015] Optionally, the aluminum foil is in the shape of a bowl, with a closed bottom serving as the front end of the medicine box; the mouth of the bowl is open and faces the ignition device, serving as the rear end of the medicine box, and the bowl is filled with ignition powder. When the ignition mechanism ignites the ignition powder, a strong impact force is generated to break through the bottom of the aluminum foil bowl, connecting the medicine box with the gas-producing area, thereby igniting the gas-producing powder and generating a large amount of gas.

[0016] Optionally, the filter barrel is cylindrical, and a plurality of partition plates are connected to the outer side of the filter barrel, the partition plates are radially distributed and connected to the inner wall of the tube shell, and the gas-producing agent is evenly distributed between the partition plates; the length of the partition plate is equal to the length of the filter barrel, one side of the partition plate is connected to the outer side of the filter barrel, and the other side is connected to the inner wall of the tube shell, and the plurality of partition plates are evenly distributed along the circumference of the outer side of the filter barrel.

[0017] Optionally, the gas guide area includes an inner gas guide barrel and an outer gas guide barrel, the inner gas guide barrel and the outer gas guide barrel are a sleeve structure, and the two gas guide barrels are concentrically arranged with the tube shell; the front and rear ends of the inner gas guide barrel are open, and the central through hole of the gas plate ring is connected to the inner gas guide barrel; the front end of the outer gas guide barrel is closed by a blocking plate, and the rear end is close to the rear end edge of the inner gas guide barrel, so as to realize the closure of the rear end of the outer gas guide barrel;

[0018] The space between the horizontal side wall of the inner air guide barrel and the horizontal side wall of the outer air guide barrel is the first air duct, and the space between the horizontal side wall of the outer air guide barrel and the inner wall of the tube shell is the second air duct. The horizontal side wall of the outer air guide barrel and the side wall of the tube shell are both provided with air outlet holes for outputting gas into the airbag.

[0019] Further optionally, a certain distance is left between the front end of the inner gas guide barrel and the front end of the outer gas guide barrel, so that the gas in the inner gas guide barrel flows from its own front end into the first air duct of the outer gas guide barrel; the rear end edge of the inner gas guide barrel expands outward to the inner wall of the tube shell, so that the gas transmitted from the gas transfer area can only enter the inner gas guide barrel.

[0020] Further optionally, a plurality of air outlet holes 1 are provided at the rear of the horizontal side wall of the outer air guide barrel, and are evenly distributed along the circumference of the outer air guide barrel, so that the gas in the first air passage enters the second air passage through the air outlet holes 1;

[0021] A plurality of second air outlet holes are arranged at a position on the side wall of the tube shell corresponding to the front of the outer air guide barrel and are evenly distributed along the circumference of the tube shell, so that the gas in the second air passage is output from the tube shell through the second air outlet holes.

[0022] The pyrotechnic gas generator described in the utility model has the following beneficial effects:

[0023] (1) The traditional steel support of the ignition mechanism has been improved. The complex all-steel structure has been improved to a combination of a steel frame and a plastic support. The steel frame has a simple structure, low processing cost, and is more stable when used. The outer side of the steel frame is also sealed with an O-ring. The ignition tool and the short-circuit clamp are fixed and buffered by the plastic support, reducing their impact on the steel frame.

[0024] (2) The partition plate in the gas production area is set up to utilize the physical isolation effect to disperse the gas producing agent more evenly inside the gas production area. After gas production, the gas is gathered in the area between two adjacent partition plates, which is conducive to the gas after gas production immediately entering the filter barrel and avoiding the gas diffusion in the gas production area and wasting gas conduction time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the pyrotechnic gas generator;

[0026] Figure 2 It is a structural schematic diagram of the ignition mechanism;

[0027] Figure 3 It is a schematic diagram of the structure of the gas transmission area and the gas guide area;

[0028] Figure 4 A schematic diagram of a filter barrel and a partition plate.

[0029] In the accompanying drawings, 1-tube shell, 2-air outlet hole 2, 3-medicine box, 4-gas production area, 5-gas transmission area, 6-gas guide area, 7-sealing plate, 8-steel skeleton, 9-O-ring, 10-short-circuit clamp, 11-ignition device, 12-aluminum foil, 13-filter barrel, 14-filter hole, 15-partition plate, 16-front barrel, 17-middle barrel, 18-rear barrel, 19-ignition powder, 20-gas producing powder, 21-gas plate ring, 22-inner air guide barrel, 23-outer air guide barrel, 24-first air duct, 25-second air duct, 26-air outlet hole 1, 27-second groove. DETAILED DESCRIPTION

[0030] This embodiment provides a pyrotechnic gas generator, such as Figure 1-Figure 4 As shown, it comprises a cylindrical tube shell 1, wherein an ignition mechanism, a medicine box 3, a gas production area 4, a gas transmission area 5, a gas guide area 6 and a blocking plate 7 are sequentially arranged inside the tube shell 1 along the axial direction thereof, and the ignition mechanism comprises an external steel frame 8 and an internal plastic support, and an O-ring 9 is arranged between the steel frame 8 and the corresponding inner wall of the tube shell 1 for sealing; an ignition tool 11 and a short-circuit clip 10 are fixed inside the plastic support;

[0031] The aluminum foil 12 serves as the edge of the medicine box 3, and the ignition powder 19 is filled between the aluminum foil 12 and the ignition device 11; the rear edge of the aluminum foil 12 is connected to the front end of the steel frame 8; the steel frame 8 is cylindrical, and the outer wall of the steel frame 8 is provided with grooves at the positions corresponding to the O-ring 9 and connected with the aluminum foil 12;

[0032] A filter barrel 13 is provided in the gas production area 4. The filter barrel 13 is concentrically arranged with the tube shell 1. The surface of the filter barrel 13 is evenly and densely covered with filter holes 14, so that the gas generated in the gas production area 4 enters the filter barrel 13 through the filter holes 14. The front end of the filter barrel 13 is open and connected to the gas transfer area 5 and the gas guide area 6 in sequence.

[0033] When manufacturing the plastic support, the ignition device 11, the short-circuit clamp 10, the steel frame 8 and the O-ring 9 are connected and arranged in relative positions, and then integrally injection molded.

[0034] Optionally, the ignition mechanism is cylindrical and is arranged concentrically with the tube shell 1. The ignition mechanism includes a steel frame 8, a plastic support, an ignition device 11 and a short-circuit clamp 10. The plastic support, the ignition device 11 and the steel frame 8 are connected by injection molding; the outer wall of the steel frame 8 and the inner wall of the tube shell 1 are sealed by an O-ring 9; the plastic support includes a front barrel 16, a middle barrel 17 and a rear barrel 18 from front to back, and the outer diameters of the middle barrel 17, the front barrel 16 and the rear barrel 18 increase successively, and the inner diameters of the middle barrel 17, the front barrel 16 and the rear barrel 18 also increase successively. The horizontal side walls of the steel frame 8 surround the outside of the front barrel 16, the vertical barrel bottom of the steel frame 8 surrounds the outside of the middle barrel 17, and the outer side wall of the rear barrel 18 is close to the inner wall of the tube shell 1 to play a sealing role.

[0035] Further optionally, the front barrel 16 has horizontal side walls and a vertical bottom, the ignition device 11 is installed inside the front barrel 16, the side walls of the front barrel 16 surround the outside of the ignition device 11, and the rear end of the ignition device 11 is close to the bottom of the front barrel 16, so that the front end of the ignition device 11 is facing the inside of the medicine box 3, thereby being able to ignite the ignition powder 19 in the medicine box 3.

[0036] Further optionally, the middle barrel 17 is a solid cylinder, the front end of the middle barrel 17 is connected to the bottom of the front barrel 16 as a whole, and the rear end of the middle barrel 17 is connected to the top of the rear barrel 18 as a whole.

[0037] Further optionally, the rear barrel 18 has horizontal side walls and a vertical barrel top, the barrel top of the rear barrel 18 is located at the front end thereof, and the short-circuit clip 10 is installed inside the rear barrel 18;

[0038] A plurality of through passages are provided at the top of the rear barrel 18 , the middle barrel 17 and the bottom of the front barrel 16 , so that the circuit of the short-circuit clip 10 can be connected to the igniter 11 in the front barrel 16 through the through passages.

[0039] Further optionally, the outer surface of the horizontal side wall of the steel skeleton 8 is provided with a circle of first grooves for arranging the O-ring 9, so that the O-ring 9 is squeezed between the steel skeleton 8 and the inner wall of the tube shell 1 to achieve sealing;

[0040] A second groove 27 is provided at the front end of the outer surface of the horizontal side wall of the steel frame 8 for clamping the rear edge of the aluminum foil 12, thereby fixing the aluminum foil 12 and thus fixing the medicine box 3;

[0041] The inner diameter of the tube shell 1 corresponding to the steel frame 8 is larger than the inner diameter of the tube shell 1 corresponding to the rear barrel 18. The steel frame 8 is limited by the contraction of the inner diameter of the tube shell 1 to prevent the strong gas pressure shock after gas production from causing the steel frame 8 and the plastic support to be misaligned as a whole.

[0042] The ignition mechanism of the present invention achieves better sealing and limiting effects with a simple structure through the double sealing of the O-ring 9 and the side wall of the rear barrel 18, as well as the tube diameter contraction design of the tube shell 1. The processing of the plastic support, the steel frame 8 and the tube shell 1 are relatively simple and easy to form. The structural strength is high and the cost is low. The first groove and the second groove 27 are filled with the rear ends of the O-ring 9 and the aluminum foil 12 respectively. When in use, the steel frame 8 is not easy to generate iron filings.

[0043] Optionally, the aluminum foil 12 is in the shape of a bowl, with a closed bottom serving as the front end of the medicine box 3, an open mouth facing the ignition device 11 and serving as the rear end of the medicine box 3, and the bowl is filled with ignition powder 19. When the ignition mechanism ignites the ignition powder 19, a strong impact force is generated to break through the bottom of the aluminum foil 12, so that the medicine box 3 is connected with the gas production area 4, thereby igniting the gas production powder 20 and generating a large amount of gas.

[0044] Optionally, there is a certain space between the rear end of the filter barrel 13 and the front end of the medicine box 3 for containing the gas-generating medicine;

[0045] The drug residues remaining after the gas generating agent 20 generates gas are filtered through the filter holes 14 , and most of the drug residues remain in the gas generating area 4 , and the gas enters the gas transfer area 5 in front through the filter barrel 13 .

[0046] Optionally, the filter barrel 13 is cylindrical, and a plurality of partition plates 15 are connected to the outer side of the filter barrel 13. The partition plates 15 are radially distributed and connected to the inner wall of the tube shell, and the gas-producing agent is evenly distributed between each partition plate 15; the length of the partition plate 15 is equal to the length of the filter barrel 13, one side of the partition plate 15 is connected to the outer side of the filter barrel 13, and the other side is connected to the inner wall of the tube shell 1, and a plurality of partition plates 15 are evenly distributed along the circumference of the outer side of the filter barrel 13, so that the gas after gas production is correspondingly gathered in the area between two adjacent partition plates 15, which is conducive to the gas after gas production to immediately enter the filter barrel 13, and avoid the gas diffusing in the gas production area 4 and wasting gas conduction time.

[0047] Optionally, the gas transfer area 5 is provided with an annular gas plate ring 21 , and the central through hole of the gas plate ring 21 is a gas transfer channel, so that the gas transmitted from the filter barrel 13 passes into the gas guide area 6 .

[0048] Optionally, the gas guide area 6 includes an inner gas guide barrel 22 and an outer gas guide barrel 23, the inner gas guide barrel 22 and the outer gas guide barrel 23 are a sleeve structure, and the two gas guide barrels are concentrically arranged with the tube shell 1; the front and rear ends of the inner gas guide barrel 22 are open, and the central through hole of the gas plate ring 21 is connected to the inner gas guide barrel 22; the front end of the outer gas guide barrel 23 is closed by the blocking plate 7, and the rear end is close to the rear end edge of the inner gas guide barrel 22, so as to realize the closure of the rear end of the outer gas guide barrel 23;

[0049] The space between the side wall of the inner air guide barrel 22 and the side wall of the outer air guide barrel 23 is the first air duct 24, and the space between the side wall of the outer air guide barrel 23 and the inner wall of the tube shell 1 is the second air duct 25. The side wall of the outer air guide barrel 23 and the side wall of the tube shell 1 are both provided with air outlet holes for outputting gas into the airbag.

[0050] Further optionally, a certain distance is left between the front end of the inner gas guiding barrel 22 and the front end of the outer gas guiding barrel 23, so that the gas in the inner gas guiding barrel 22 flows from its own front end into the first air duct 24 of the outer gas guiding barrel 23; the rear end edge of the inner gas guiding barrel 22 expands outward to the inner wall of the tube shell 1, so that the gas transmitted from the gas transfer area 5 can only enter the inner gas guiding barrel 22.

[0051] Further optionally, a plurality of air outlet holes 26 are provided at the rear of the horizontal side wall of the outer air guide barrel 23 and are evenly distributed along the circumference of the outer air guide barrel 23, so that the gas in the first air passage 24 enters the second air passage 25 through the air outlet holes 26;

[0052] A plurality of second air outlet holes 2 are provided on the side wall of the tube shell 1 corresponding to the front of the outer air guide barrel 23 and are evenly distributed along the circumference of the tube shell 1 , so that the gas in the second air passage 25 is output from the tube shell 1 through the second air outlet holes 2 .

[0053] The arrangement of the inner air guide barrel 22, the outer air guide barrel 23, the first air duct 24 and the second air duct 25 in the above-mentioned air guide area 6 allows the gas to flow back and forth in the air guide area 6, leaving the remaining drug residue in the air guide area 6, and only pure gas is output from the tube shell 1, ensuring that there is no drug residue in the safety airbag, preventing the drug residue from entering the airbag and damaging the airbag.

Claims

1. A pyrotechnic gas generator, characterized in that: It includes a cylindrical shell, inside which an ignition mechanism, a medicine box, a fire transmission area, a gas production area, a gas guide area and a blocking plate are arranged in sequence along the axial direction of the shell. The ignition mechanism includes an external steel frame and an internal plastic support. An O-ring is provided between the steel frame and the corresponding inner wall of the shell for sealing. The ignition tool and the short-circuit clamp are fixed inside the plastic support. The aluminum foil is used as the edge of the medicine box, and ignition powder is filled between the aluminum foil and the ignition device; the rear edge of the aluminum foil is connected to the front end of the steel frame; the steel frame is barrel-shaped, and the outer wall of the steel frame is provided with grooves at the positions corresponding to the O-ring and connected with the aluminum foil; A filter barrel is provided in the gas production area. The filter barrel is concentrically arranged with the tube shell. The surface of the filter barrel is evenly and densely covered with filter holes, so that the gas generated in the gas production area enters the filter barrel through the filter holes. The front end of the filter barrel is open and connected to the gas transmission area and the gas guide area in sequence.

2. The pyrotechnic gas generator according to claim 1, characterized in that The ignition mechanism is cylindrical and is arranged concentrically with the tube shell. The ignition mechanism includes a steel frame, a plastic support, an ignition tool and a short-circuit clamp. The plastic support, the ignition tool and the steel frame are connected by injection molding; the outer wall of the steel frame and the inner wall of the tube shell are sealed by an O-ring; the plastic support includes a front barrel, a middle barrel and a rear barrel from front to back, and the outer diameters and inner diameters of the middle barrel, the front barrel and the rear barrel increase successively. The side walls of the steel frame surround the outside of the front barrel, and the barrel bottom of the steel frame surrounds the outside of the middle barrel.

3. The pyrotechnic gas generator according to claim 2, characterized in that The front barrel has a horizontal side wall and a vertical barrel bottom, the igniter is covered inside the front barrel, the side wall of the front barrel surrounds the outside of the igniter, the rear end of the igniter is close to the barrel bottom of the front barrel, so that the front end of the igniter faces the inside of the medicine box, so as to ignite the ignition powder in the medicine box; The middle barrel is a solid cylinder, the front end of the middle barrel is connected to the bottom of the front barrel as a whole, and the rear end of the middle barrel is connected to the top of the rear barrel as a whole.

4. The pyrotechnic gas generator according to claim 3, characterized in that The rear tub has horizontal side walls and a vertical tub top, the tub top of the rear tub is located at the front end of the rear tub, and the short-circuit clip is installed inside the rear tub; A plurality of through passages are provided on the top of the rear barrel, the middle barrel and the bottom of the front barrel, so that the circuit of the short-circuit clip can be connected to the ignition device in the front barrel through the through passages.

5. The pyrotechnic gas generator according to claim 4, characterized in that The outer surface of the horizontal side wall of the steel frame is provided with a circle of first grooves for arranging an O-ring, so that the O-ring is squeezed between the steel frame and the inner wall of the tube shell to achieve sealing; A circle of second grooves is arranged at the front end of the outer surface of the side wall of the steel frame, which is used to clamp the rear edge of the aluminum foil, thereby fixing the aluminum foil and the medicine box.

6. The pyrotechnic gas generator according to claim 5, characterized in that The aluminum foil is in the shape of a bowl, with a closed bottom serving as the front end of the medicine box, an open mouth facing the igniter and serving as the rear end of the medicine box, and ignition powder filled in the bowl. When the ignition powder is ignited by the ignition device, a strong impact force is generated to break the bottom of the aluminum foil bowl, thereby connecting the medicine box with the gas production area.

7. The pyrotechnic gas generator according to claim 1, characterized in that The filter barrel is cylindrical, and a plurality of partition plates are connected to the outer side of the filter barrel. The partition plates are radially distributed and connected to the inner wall of the tube shell, and the gas-producing agent is evenly distributed between the partition plates. The length of the partition plate is equal to the length of the filter barrel, one side of the partition plate is connected to the outer side of the filter barrel, and the other side is connected to the inner wall of the tube shell. The plurality of partition plates are evenly distributed along the circumference of the outer side of the filter barrel.

8. The pyrotechnic gas generator according to claim 1, characterized in that The gas guide area includes an inner gas guide barrel and an outer gas guide barrel. The inner gas guide barrel and the outer gas guide barrel are a sleeve structure. The two gas guide barrels are concentrically arranged with the tube shell. The front and rear ends of the inner gas guide barrel are open, and the central through hole of the gas plate ring is connected to the inner gas guide barrel. The front end of the outer gas guide barrel is closed by a blocking plate, and the rear end is close to the rear end edge of the inner gas guide barrel to achieve the closure of the rear end of the outer gas guide barrel. The space between the side wall of the inner air guide barrel and the side wall of the outer air guide barrel is the first air duct, and the space between the side wall of the outer air guide barrel and the inner wall of the tube shell is the second air duct. The side wall of the outer air guide barrel and the side wall of the tube shell are both provided with air outlet holes for outputting gas into the airbag.

9. The pyrotechnic gas generator according to claim 8, characterized in that A certain distance is left between the front end of the inner gas guide barrel and the front end of the outer gas guide barrel, so that the gas in the inner gas guide barrel flows from its front end into the first air passage of the outer gas guide barrel; the rear end edge of the inner gas guide barrel expands outward to the inner wall of the tube shell, so that the gas transmitted from the gas transfer area can only enter the inner gas guide barrel.

10. The pyrotechnic gas generator according to claim 9, characterized in that A plurality of air outlet holes 1 are provided at the rear of the side wall of the outer air guide barrel, and are evenly distributed along the circumference of the outer air guide barrel, so that the gas in the first air passage enters the second air passage through the air outlet holes 1; A plurality of second air outlet holes are arranged at a position on the side wall of the tube shell corresponding to the front of the outer air guide barrel and are evenly distributed along the circumference of the tube shell, so that the gas in the second air passage is output from the tube shell through the second air outlet holes.

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