Gas generator for gas curtain with double-cavity structure

Abstract

The gas generator comprises a first pipe body, a second pipe body and a third pipe body which are communicated with the interior of the first pipe body are fixed outside the two ends of the first pipe body in a sealed mode respectively, a detonating structure is arranged on one side of the first pipe body, and one end of the detonating structure penetrates through the side wall of the first pipe body and then is located in the first pipe body; the other end of the detonating structure is located outside the first pipe body, the part, penetrating through the first pipe body, of the detonating structure is fixedly connected with the first pipe body in a sealed mode, an exhaust hole is formed in the other corresponding side of the first pipe body, baffle rings are fixed in the two ends of the first pipe body respectively, the detonating structure is located between the baffle rings at the two ends of the first pipe body, first through holes are formed in the baffle rings, and the first through holes are covered with membranes. The diaphragm is fixedly connected with the first through hole in a sealed mode, the second pipe body and the third pipe body jointly form a sealed cavity with the baffle ring on the same side, and the sealed cavity is filled with gas. The invention has the beneficial effects that the purpose of opening the diaphragm without using a large-dose ignition tube is achieved, and the diaphragm can also be quickly opened by using a small-dose ignition tube.

Description

Technical Field

[0001] This invention relates to the technical field of gas generators, and in particular to a gas generator for a dual-chamber air curtain. Background Technology

[0002] The automotive gas generator is the "inflation power source" of the airbag. When a collision occurs, it triggers the ignition action according to the signal indication, igniting the gas generating agent such as sodium azide or new solid fuel, instantly producing a large amount of gas, causing the airbag to inflate instantly and cushion the impact on the occupants.

[0003] Chinese Patent No. CN220884311U, authorized on May 3, 2024, discloses a novel high-safety side curtain gas generator. It includes a tube body, with an ignition assembly installed at one end of the tube body, the ignition assembly being sealed to the tube body. A support plate is fixed inside the tube body, and the support plate has several filter holes. A ignition propellant is disposed inside the tube body, with both the ignition propellant and the ignition assembly located on one side of the support plate. A diffusion device is installed at the other end of the tube body, and the diffusion device is sealed to the tube body. An inert gas is also disposed inside the tube body, with both the diffusion device and the inert gas located on the other side of the support plate.

[0004] The diffusion device includes a diffuser body, which is installed at the port of a tube and sealed to it. The diffuser body has an internal cavity, and a connecting through-hole is provided on the end wall of the cavity. The inner side of the tube and the inner side of the cavity are connected through the connecting through-hole. Several exhaust holes are provided on the side wall of the cavity. Inert gas under high pressure enters the cavity inside the diffuser body through the connecting through-hole and is released into the gas bladder through the exhaust holes on the side wall of the cavity. The structure is simple, with few parts, and low cost. A rupture membrane is fixed to the inner side of the connecting through-hole.

[0005] As can be seen from the aforementioned patents, current gas generators for air curtain applications generally have only one gas-carrying chamber, with the ignition tube typically located at one end and the diffuser at the other. For rapid TTFG (Total Turbine-to-Fountain Gathering), a large-charge ignition tube is needed to generate a shock wave that opens the diffuser diaphragm. A small-charge ignition tube, however, requires the use of a ignition charge; the ignition tube first ignites the ignition charge, and the combustion generates pressure that then breaks through the diffuser diaphragm. In this case, the TTFG time is significantly slower than that generated by a large-charge ignition tube. Furthermore, with a single chamber, adjusting the gas flow and gas mole requires readjusting the tube length, which is very inconvenient. Moreover, given the existing structure with an ignition tube at one end and a diffuser at the other, the longer the tube, the slower the TTFG time. Summary of the Invention

[0006] The present invention aims to overcome the shortcomings of existing technologies that require the use of a large-volume ignition tube to generate a shock wave to open the diaphragm, and provides a dual-chamber structure gas generator for air curtains that can open the diaphragm without the need for a large-volume ignition tube.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A gas generator for a dual-chamber air curtain includes a tube body one. Two tube bodies two and three, which are connected to the tube body two and three respectively, are sealed and fixed to the outside of the tube body one. A detonation structure is provided on one side of the tube body one. One end of the detonation structure penetrates the side wall of the tube body one and is located inside the tube body one, while the other end of the detonation structure is located outside the tube body one. The portion of the detonation structure penetrating the tube body one is sealed and fixedly connected to the tube body one. An exhaust port is provided on the opposite side of the tube body one. Retaining rings are fixed inside both ends of the tube body one. The detonation structure is located between the retaining rings at both ends of the tube body one. A through hole is provided on each retaining ring. A diaphragm is covered by the through hole and is sealed and fixedly connected to the through hole one. The tube bodies two and three, together with the retaining rings on the same side, form a sealed cavity, which is filled with gas.

[0008] The outer ends of the first tube are respectively sealed and fixed to the inner ends of the second tube and the third tube, which are connected to the inner ends of the tube. The first tube has a detonation structure on one side. One end of the detonation structure penetrates the side wall of the first tube and is located inside the first tube. The other end of the detonation structure is located outside the first tube. The part of the detonation structure that penetrates the first tube is sealed and fixedly connected to the first tube. The other side of the first tube has an exhaust hole. The inner ends of the first tube have retaining rings respectively. The detonation structure is located between the retaining rings at both ends of the first tube. The retaining ring has a through hole. A diaphragm is covered by the through hole. The diaphragm is sealed and fixedly connected to the through hole. The second tube and the third tube together with the retaining rings on the same side form a sealed cavity. The sealed cavity is filled with gas. The initiation structure is located between the retaining rings at both ends of tube one, making the initiation structure close to the diaphragm. The initiation structure can quickly open the diaphragm with the shock wave, releasing the gas in the sealed cavity, thus achieving rapid TTFG. Therefore, it achieves the goal of opening the diaphragm without using a large-volume ignition tube, and a small-volume ignition tube can also quickly open the diaphragm. Because it has two sealed cavities, adjusting the output of the gas generator later becomes simple. Only the lengths of tube two and tube three need to be changed to quickly change the output of the gas generator. The process changes are small, and there is no need to worry about the TTFG slowing down due to the lengthening of the tubes. When the length of one of tubes two or three is changed to the shortest, it is equivalent to a cover plate, which can seal one end of tube one.

[0009] Preferably, the detonation structure includes a propellant cup, the bottom of which penetrates the side wall of the tube body and is located inside the tube body. The bottom of the propellant cup has two through holes on its left and right sides, corresponding to and communicating with the through hole on the same side. The outer wall of the propellant cup is sealed and fixedly connected to the tube body. The open end of the propellant cup is located outside the tube body and is equipped with an ignition container. One end of the ignition container is sealed and fixedly connected to the open end of the propellant cup. An ignition tube is fixed inside the ignition container, one end of which is located inside the propellant cup, and the other end of which is located inside the other end of the ignition container. The structural relationship between the ignition container and the ignition tube is prior art and will not be described in detail here. After receiving an electrical pulse signal, the ignition tube generates a shock wave that, through the two through holes, quickly opens the diaphragm at the first through hole, releasing the gas in the sealed cavity and achieving rapid TTFG.

[0010] Preferably, the powder cup contains heat-generating gunpowder located at the bottom. Simultaneously with the ignition tube opening the diaphragm, the heat-generating gunpowder also combusts. The gas within the sealed cavity is heated by the heat released from the gunpowder and then released into the gas bag through the exhaust port of the tube body. Therefore, utilizing the heat-generating gunpowder can further increase the output of the gas generator to meet the requirements of different gas bag modules.

[0011] Preferably, the two through holes are covered with a sealing aluminum film, which is fixedly connected to the two through holes in a sealed manner. The sealing aluminum film plays a sealing role for the heat-generating gunpowder to ensure the combustion effect of the heat-generating gunpowder.

[0012] Preferably, the tube body is equipped with a filter screen that completely covers the exhaust port. The filter screen is located outside the bottom of the medicine cup and is fixedly connected to the side wall of the tube body. The filter screen is used to intercept residues generated during the combustion process, preventing residues from being rushed into the gas bag with the gas and causing secondary damage.

[0013] Preferably, the center of the second through-hole is on the same horizontal line as the center of the diaphragm. This allows the shock wave generated after the ignition tube receives the electrical pulse signal to quickly open the diaphragm at the first through-hole after passing through the second through-hole, releasing the gas in the sealed cavity and achieving rapid TTFG.

[0014] Preferably, one end of tube two and one end of tube three are respectively sealed and fixedly connected to the end of tube one. The other ends of tube two and tube three are each provided with valve holes, and safety sealing valves are detachably connected to these valve holes, with the safety sealing valves sealingly connected to the valve holes. When the internal pressure of tube two or tube three exceeds the rated pressure, the safety sealing valves can automatically release the pressure, thereby preventing tube two or tube three from exploding due to excessive internal pressure and improving safety.

[0015] The beneficial effects of this invention are: 1. The initiation structure is close to the diaphragm, and the initiation structure can quickly open the diaphragm with the shock wave to release the gas in the sealed cavity, thereby achieving rapid TTFG; 2. Because the initiation structure is close to the diaphragm, the diaphragm can be opened without using a large-volume ignition tube, and a small-volume ignition tube can also open the diaphragm quickly. 3. Due to the presence of two sealed chambers, adjusting the output of the gas generator later becomes simple. Only the length of the second tube needs to be changed to quickly change the output of the gas generator. The process changes are minimal, and there is no need to worry about the TTFG slowing down due to the lengthening of the tube. 4. At the same time the ignition tube opens the diaphragm, the heat-generating propellant also burns. The gas in the sealed cavity is heated by the heat released by the heat-generating propellant and then released into the gas bag through the exhaust port of tube one. Therefore, the output of the gas generator can be further improved by using the heat-generating propellant to meet the requirements of different gas bag modules. Attached Figure Description

[0016] Figure 1 This is an embodiment of the present invention. Figure 1 ; Figure 2 This is an embodiment of the present invention. Figure 2 .

[0017] In the diagram: 1. Tube body one, 2. Tube body two, 3. Initiation structure, 4. Vent hole, 5. Retaining ring, 6. Through hole one, 7. Diaphragm, 8. Sealing cavity, 9. Propellant cup, 10. Through hole two, 11. Ignition container, 12. Ignition tube, 13. Heat-generating propellant, 14. Sealing aluminum membrane, 15. Filter screen, 16. Valve hole, 17. Safety sealing valve, 18. Tube body three. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of components illustrated in these embodiments do not limit the scope of this application. For ease of illustration, spatial relative terms such as “upper,” “lower,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “below” other elements or features would be fixed “upper” to other elements or features. Thus, the exemplary term “lower” can include both upper and lower orientations. The device may be fixed in other ways (rotated 90 degrees or located in other orientations), and the spatial relative descriptions used herein can be interpreted accordingly. It should also be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale. Techniques, processes, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, processes, and equipment should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0021] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0022] like Figure 1 and Figure 2In the embodiments described, a gas generator for a dual-chamber air curtain includes a tube body 1. Two tube bodies 2 and 3 18, which are connected to the tube body 1, are respectively sealed and fixed to the outside of the tube body 1. A detonation structure 3 is provided on one side of the tube body 1. One end of the detonation structure 3 penetrates the side wall of the tube body 1 and is located inside the tube body 1, while the other end of the detonation structure 3 is located outside the tube body 1. The portion of the detonation structure 3 penetrating the tube body 1 is sealed and fixedly connected to the tube body 1. An exhaust port 4 is provided on the corresponding other side of the tube body 1. Retaining rings 5 ​​are fixed inside the two ends of the tube body 1. The detonation structure 3 is located between the retaining rings 5 ​​at both ends of the tube body 1. A through hole 6 is provided on the retaining ring 5. A diaphragm 7 covers the through hole 6 and is sealed and fixedly connected to the through hole 6. The tube body 2 and the tube body 3 18, together with the retaining rings 5 ​​on the same side, form a sealed cavity 8, which is filled with gas.

[0023] The detonation structure 3 includes a propellant cup 9. The bottom of the propellant cup 9 penetrates the side wall of the tube body 1 and is located inside the tube body 1. The left and right sides of the bottom of the propellant cup 9 are respectively provided with through holes 10 corresponding to and communicating with through holes 6 on the same side. The outer side wall of the propellant cup 9 is sealed and fixedly connected to the tube body 1. The open end of the propellant cup 9 is located outside the tube body 1 and is provided with an ignition container 11. One end of the ignition container 11 is sealed and fixedly connected to the open end of the propellant cup 9. An ignition tube 12 is fixed inside the ignition container 11. One end of the ignition tube 12 is located inside the propellant cup 9, and the other end of the ignition tube 12 is located inside the other end of the ignition container 11.

[0024] In Example 1, after the ignition tube 12 receives the electrical pulse signal, it generates a shock wave that passes through the second through hole 10 and quickly opens the diaphragm 7 at the first through hole 6, releasing the gas in the sealed cavity 8 and achieving rapid TTFG; the gas in the sealed cavity 8 is then released into the gas bag through the exhaust hole 4 of the tube body 1.

[0025] like Figure 2 As shown, the medicine cup 9 contains a heat-generating gunpowder 13, which is located at the bottom of the medicine cup 9. A sealing aluminum membrane 14 covers the through hole 2 10, and the sealing aluminum membrane 14 is sealed and fixedly connected to the through hole 2 10. A filter screen 15 is provided inside the tube body 1, completely covering the exhaust hole 4. The filter screen 15 is located outside the bottom of the medicine cup 9 and is fixedly connected to the side wall of the tube body 1.

[0026] like Figure 1 and Figure 2 As shown, the center of the through hole 2 10 is on the same horizontal line as the center of the diaphragm 7. One end of the tube body 2 and one end of the tube body 3 18 are respectively sealed and fixedly connected to the end of the tube body 1. The other end of the tube body 2 and the other end of the tube body 3 18 are provided with valve holes 16. A safety sealing valve 17 is detachably connected to the valve hole 16, and the safety sealing valve 17 is sealed to the valve hole 16.

[0027] In Example 2, after receiving an electrical pulse signal, the ignition tube 12 generates a shock wave that breaks through the sealing aluminum membrane 14 through the second through hole 10, thereby quickly opening the diaphragm 7 at the first through hole 6 and releasing the gas in the sealed cavity 8. At the same time as the ignition tube 12 opens the diaphragm 7, the heat-generating propellant 13 also burns. The gas in the sealed cavity 8 is heated by the heat released by the heat-generating propellant 13, and then filtered through the filter screen 15 before being released into the gas bag through the exhaust port 4 of the tube body 1. Therefore, the heat-generating propellant 13 can be used to further improve the output of the gas generator to meet the requirements of different airbag modules.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A twin-chamber gas curtain gas generator characterized by comprising: The application relates to a tube body one (1), the outer ends of the tube body one (1) are respectively sealed and fixed with a tube body two (2) and a tube body three (18) which are connected with the interiors of the tube body one (1), one side of the tube body one (1) is provided with an initiating structure (3), one end of the initiating structure (3) penetrates through the side wall of the tube body one (1) and is located in the tube body one (1), the other end of the initiating structure (3) is located outside the tube body one (1), the part of the initiating structure (3) penetrating through the tube body one (1) is sealed and fixedly connected with the tube body one (1), the other side of the tube body one (1) is provided with an exhaust hole (4), the two ends of the tube body one (1) are respectively fixed with a baffle ring (5), the initiating structure (3) is located between the baffle rings (5) at the two ends of the tube body one (1), the baffle ring (5) is provided with a through hole one (6), the through hole one (6) is covered with a diaphragm (7), the diaphragm (7) is sealed and fixedly connected with the through hole one (6), the tube body two (2) and the tube body three (18) jointly form a sealed cavity (8) between the baffle rings (5) on the same side, and the sealed cavity (8) is filled with gas.

2. The dual-chamber gas curtain gas generator according to claim 1, wherein The initiating structure (3) comprises a medicine cup (9), the bottom of the medicine cup (9) penetrates through the side wall of the tube body one (1) and is located in the tube body one (1), the left and right sides of the bottom of the medicine cup (9) are respectively provided with through holes two (10) which are connected with the through holes one (6) on the same side in a corresponding mode, the outer side wall of the medicine cup (9) is sealed and fixedly connected with the tube body one (1), the opening end of the medicine cup (9) is located outside the tube body one (1) and is provided with an ignition container (11), one end of the ignition container (11) is sealed and fixedly connected with the opening end of the medicine cup (9), the ignition container (11) is fixedly provided with an ignition tube (12) inside, one end of the ignition tube (12) is located in the medicine cup (9), and the other end of the ignition tube (12) is located in the other end of the ignition container (11).

3. The dual-chamber gas curtain gas generator according to claim 2, characterized by The medicine cup (9) is provided with heat-producing gunpowder (13) inside, and the heat-producing gunpowder (13) is located at the bottom of the medicine cup (9).

4. The dual-chamber gas curtain gas generator according to claim 3, characterized by The through hole two (10) is covered with a sealed aluminum film (14), and the sealed aluminum film (14) is sealed and fixedly connected with the through hole two (10).

5. The dual-chamber gas curtain gas generator according to claim 3, wherein The tube body one (1) is provided with a filter screen (15) inside, the filter screen (15) completely covers the exhaust hole (4), and the filter screen (15) is located outside the bottom of the medicine cup (9) and is fixedly connected with the side wall of the tube body one (1).

6. A dual-chamber gas curtain gas generator according to claim 2 or 3 or 4 or 5, characterized by The center of the through hole two (10) and the center of the diaphragm (7) are located on the same horizontal line.

7. The dual-chamber gas curtain gas generator according to claim 1 or 2 or 3 or 4 or 5, characterized by, One end of the tube body two (2) and one end of the tube body three (18) are respectively sealed and fixedly connected with the two ends of the tube body one (1), the other end of the tube body two (2) and the other end of the tube body three (18) are both provided with a valve hole (16), the valve hole (16) is detachably connected with a safety sealing valve (17), and the safety sealing valve (17) is sealedly connected with the valve hole (16).

Images