Mixed gas generator and automobile safety air bag

Abstract

The utility model relates to the technical field of gas generators, in particular to a mixed gas generator and an automobile safety air bag. The mixed gas generator comprises a pipe body, an ignition assembly and an exhaust assembly; the ignition assembly and the exhaust assembly are connected to the two ends of the pipe body correspondingly, and the pipe body is filled with high-pressure inert mixed gas. The ignition assembly and the exhaust assembly are both in interference fit with the pipe body and are connected to the corresponding ends of the pipe body in a welded mode. The mixed gas generator is simple in structure, convenient to install, good in sealing performance, stable and reliable, the requirements for the manufacturing process and precision of parts can be lowered, and then the manufacturing and using cost can be lowered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas generator, specifically, relate to a mixed gas generator and automobile safety air bag. BACKGROUND

[0002] As the core component of automobile safety air bag - automobile safety air bag gas generator, after receiving the collision signal, with proper speed and mass flow rate, the appropriate amount of gas is produced to fill the air bag, thereby protecting the driver and passenger.

[0003] But the existing automobile safety air bag gas generator in the process of making, the process requirement is higher, and in the production, the incompatibility, the sealing performance does not reach the standard situation appears easily, and because its internal storage has high pressure gas, therefore, if there is sealing defect, high pressure gas may leak slowly, cause the generator failure. UTILITY MODEL CONTENTS

[0004] The utility model discloses a mixed gas generator and automobile safety air bag, which has simple structure, convenient installation, good sealing performance, stability and reliability, and can reduce the manufacturing process and precision requirements of parts, thereby reducing the production and use cost.

[0005] The embodiment of the utility model can be realized as follows:

[0006] In a first aspect, the utility model provides a mixed gas generator, and the mixed gas generator comprises a pipe body, an ignition assembly and an exhaust assembly.

[0007] The ignition assembly and the exhaust assembly are connected to the two ends of the pipe body respectively, and the pipe body is filled with high-pressure inert mixed gas.

[0008] Among them, the ignition assembly and the exhaust assembly are in interference fit with the pipe body, and are welded to the corresponding end of the pipe body.

[0009] In an optional embodiment, the ignition assembly comprises a base, a short-circuit socket, an electric detonator, an electric detonator container and a powder cup.

[0010] The base is in interference fit with the pipe body and is welded to the pipe body; the short-circuit socket and the electric detonator are connected to the base, and the short-circuit socket is electrically connected to the electric detonator; the electric detonator container covers the electric detonator and is connected to the base, and the powder cup is connected to the electric detonator container.

[0011] Among them, the powder cup is filled with ignition powder.

[0012] In an optional embodiment, the electric detonator container is welded to the base, and the powder cup is welded to the electric detonator container.

[0013] In an optional embodiment, a sealing ring is arranged between the contact surface of the electric detonation tube and the base.

[0014] In an optional embodiment, a pressing edge is arranged on the inner side of the base and abuts against the outer periphery of the electric detonation tube, and the sealing ring is arranged between the contact surface of the pressing edge and the electric detonation tube.

[0015] In an optional embodiment, the pressing edge is arranged on the inner side of the electric detonation tube container.

[0016] In an optional embodiment, a buffer pad is arranged in the powder cup and located at the end of the powder cup close to the electric detonation tube; and a plurality of flow guide holes are arranged in the buffer pad along the direction from the electric detonation tube to the powder cup.

[0017] In an optional embodiment, the exhaust assembly comprises an exhaust end cover and a burst disc, the exhaust end cover is in interference fit with the tube body and is welded to the tube body, and the burst disc is welded to the inner side of the exhaust end cover.

[0018] In an optional embodiment, a gas injection hole is arranged on the outer periphery of the tube body, and a sealing member is welded to the gas injection hole.

[0019] In a second aspect, the utility model provides a kind of automobile safety air bag, and automobile safety air bag includes the mixed gas generator described above.

[0020] The mixed gas generator and the automobile safety air bag provided by the utility model embodiment have the beneficial effects, which include:

[0021] The mixed gas generator comprises a tube body, an ignition assembly and an exhaust assembly; the ignition assembly and the exhaust assembly are connected to two ends of the tube body respectively, and the tube body is filled with high-pressure inert mixed gas; wherein the ignition assembly and the exhaust assembly are in interference fit with the tube body, and are welded to the corresponding end of the tube body. The mixed gas generator has simple structure, convenient installation, good sealing property, and is stable and reliable, and can also reduce the requirements for manufacturing process and precision of parts, thereby reducing the cost of production and use. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Fig. 1 The structure diagram of the mixed gas generator provided by the embodiment is shown in the figure.

[0024] Fig. 2 The structure diagram of the tube body and the ignition assembly provided by the embodiment is shown in the figure.

[0025] Fig. 3 The structure schematic diagram of the pipe body and the exhaust assembly is provided for the embodiment.

[0026] Icon: 100-mixed gas generator; 110-pipe body; 120-ignition assembly; 130-exhaust assembly; 121-base; 122-short circuit socket; 123-electric detonation tube; 124-electric detonation tube container; 125-powder cup; 101-ignition powder; 126-sealing ring; 127-pressing edge; 128-cushion pad; 129-flow guide hole; 131-exhaust end cover; 132-bursting disc; 111-gas injection hole; 112-sealing element. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0029] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0032] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0033] The inventors have discovered through research that during the assembly process of existing generators, the exhaust cover is welded to the connecting block, which is then welded to the tube body, with the welding contact being surface-to-surface contact. However, whether the exhaust cover and the connecting block are interference fit or clearance fit, the welded end faces of the exhaust cover and the connecting block cannot be completely fitted together, resulting in poor welding, and the manufacturing process requirements for the exhaust cover and the connecting block are relatively high. The welding of the tube body and the connecting block not only has the above-mentioned problems, but also has problems with the centering of the two, which can easily cause defects such as poor product appearance during production. Moreover, high-pressure gas is stored between the tube body and the connecting block. If there are defects in the welding, it is likely to cause the high-pressure gas to slowly leak, causing the generator to fail.

[0034] The electric squib at the ignition end is hard-connected to the ignition component. This can cause high-temperature, high-pressure gas to leak from the connection when the electric squib is ignited, preventing the top of the ignition component from being opened, resulting in ignition failure. The high-pressure gas cannot open the bursting disc, and the generator cannot work properly. Furthermore, the powder cup and the connecting component are threaded. Given the general lifespan of a generator of more than 15 years, this threaded connection is not very stable and reliable, and there is a risk of failure and falling off. Furthermore, when the electric squib is working, it is possible that the powder cup will be disengaged due to impact, causing ignition failure and the generator to not work properly.

[0035] For the reasons above, please refer to Figs. 1-3 , this embodiment provides a mixed gas generator 100, the mixed gas generator 100 includes a tube body 110, an ignition component 120 and an exhaust component 130;

[0036] The ignition assembly 120 and the exhaust assembly 130 are respectively connected to the two ends of the tube body 110, and the tube body 110 is filled with high-pressure inert mixed gas;

[0037] The ignition assembly 120 and the exhaust assembly 130 are both interference-fitted with the tube body 110 and are welded to corresponding ends of the tube body 110 .

[0038] Please refer to Figs. 1-3 The working principle of the mixed gas generator 100 is:

[0039] The mixed gas generator 100 includes a tube body 110, an ignition assembly 120 and an exhaust assembly 130; the ignition assembly 120 and the exhaust assembly 130 are respectively connected to the two ends of the tube body 110, and the tube body 110 is filled with a high-pressure inert mixed gas; wherein, the ignition assembly 120 and the exhaust assembly 130 are both interference fit with the tube body 110 and welded to the corresponding ends of the tube body 110.

[0040] Therefore, during the manufacturing and assembling process, the mixed gas generator 100 adopts the interference fit and laser welding connection between the ignition assembly 120 and the pipe body 110, so as to reduce the requirements for the manufacturing process and precision of the spare parts, and further reduce the manufacturing and using cost. In addition, the interference fit and laser welding connection can simplify the structure, facilitate the assembling, and improve the stability.

[0041] Further, please refer to Figs. 1-3 In the embodiment, the ignition assembly 120 includes a base 121, a short circuit socket 122, an electric detonator 123, an electric detonator container 124 and a powder cup 125.

[0042] The base 121 is interference fit with the pipe body 110 and is welded to the pipe body 110. The short circuit socket 122 and the electric detonator 123 are connected with the base 121, and the short circuit socket 122 is electrically connected with the electric detonator 123. The electric detonator container 124 covers the electric detonator 123 and is connected with the base 121. The powder cup 125 is connected with the electric detonator container 124. The powder cup 125 is filled with ignition powder 101.

[0043] Therefore, when installing the ignition assembly 120, the base 121 is interference fit with the pipe body 110 and is laser welded to the pipe body 110, so as to reduce the requirements for the manufacturing process and precision of the base 121, and further simplify the manufacturing and using cost. On this basis, the short circuit socket 122 and the electric detonator 123 are connected with the base 121, and the electric detonator container and the powder cup 125 are installed. Since the short circuit socket 122 needs to be connected with the external structure, when the short circuit socket 122 and the electric detonator 123 are connected with the base 121, the short circuit socket 122 is connected with the end of the base 121 away from the pipe body 110, and the electric detonator 123 is connected with the end of the base 121 inside the pipe body 110, so as to connect the electric detonator container 124 with the base 121 and cover the electric detonator 123.

[0044] On this basis, in order to improve the stability of the structure, the electric detonator container 124 is welded to the base 121, and the powder cup 125 is welded to the electric detonator container 124.

[0045] It should be noted that in the embodiment, the welding connection mentioned throughout the text can be laser welding.

[0046] In use, since the electric detonator 123 is connected with the base 121, and the electric detonator container 124 covers the electric detonator 123 and is connected with the base 121, in order to avoid the gas in the tube body 110 leaking through the gap between the electric detonator 123 and the base 121, a sealing ring 126 is arranged between the contact surface of the electric detonator 123 and the base 121.

[0047] In order to improve the installation stability of the sealing ring 126 and the electric detonator 123, a pressing edge 127 is arranged on the inner side of the base 121, the pressing edge 127 abuts against the outer periphery of the electric detonator 123, and the sealing ring 126 is located between the contact surface of the pressing edge 127 and the electric detonator 123. The pressing edge 127 is located on the inner side of the electric detonator container 124.

[0048] Through the above arrangement, the stability of the structure can be improved, so that the base 121, the electric detonator 123 and the base 121 of the electric detonator 123 can form an integral structure, and after the powder cup 125 is connected with the electric detonator container 124, the installation stability of the overall structure of the ignition assembly 120 can be improved.

[0049] In addition, in order to improve the stability of the ignition powder 101 in the powder cup 125, and enable the high-temperature gas flow generated by the electric detonator 123 in use to be introduced into the powder cup 125 to ignite the ignition powder 101 in the powder cup 125, a buffer pad 128 is arranged in the powder cup 125, the buffer pad 128 is located at one end of the powder cup 125 close to the electric detonator 123, and a plurality of flow guide holes 129 are arranged in the buffer pad 128 along the direction from the electric detonator 123 to the powder cup 125. Therefore, the high-temperature gas flow generated by the electric detonator 123 in operation can be introduced into the powder cup 125 through the plurality of flow guide holes 129.

[0050] When the exhaust assembly 130 is arranged, please refer to Figs. 1-3 In the embodiment, the exhaust assembly 130 includes an exhaust end cover 131 and a bursting disc 132, the exhaust end cover 131 is in interference fit with the tube body 110 and is welded to the tube body 110, and the bursting disc 132 is welded to the inner side of the exhaust end cover 131. In this way, the structural process and precision requirement of the exhaust assembly 130 can be reduced, and the sealing property and installation stability can be improved.

[0051] In order to facilitate the injection of high-pressure inert gas into the tube body 110, a gas injection hole 111 is arranged on the outer periphery of the tube body 110, and a sealing member 112 is welded to the gas injection hole 111. After the high-pressure inert gas is injected into the tube body 110, the sealing member 112 can be welded to the gas injection hole 111 to seal the gas injection hole 111, so that the leakage of the inert gas can be avoided.

[0052] Based on the above mixed gas generator 100, please refer to Figs. 1-3 The present embodiment also provides an automobile safety airbag, which comprises the above mixed gas generator 100. By using the above mixed gas generator 100, the sealing property and use stability can be provided, the structure and manufacturing requirements can be simplified, and the manufacturing cost can be reduced.

[0053] In summary, the mixed gas generator 100 is composed of a tube body 110, high-pressure inert mixed gas in the tube body 110, a sealing member 112, an ignition assembly 120, and an exhaust assembly 130.

[0054] The powder cup 125 and the electric detonation tube container 124 are fixed together by laser welding. The powder cup 125 has a small hole at the bottom, which is beneficial for heat transfer.

[0055] A sealing ring 126 is added between the electric detonation tube 123 and the base 121. The inner side edge of the base 121 is folded to form a pressing edge 127. The electric detonation tube 123, the sealing ring 126, and the base 121 are tightly pressed together by the pressing edge 127 to form a reliable seal, preventing gas from leaking from the electric detonation tube 123 when it is electrically detonated.

[0056] The electric detonation tube container 124 and the base 121 are fixed together by laser welding. The electric detonation tube container 124, the base 121, the electric detonation tube 123, and the sealing ring 126 form a closed whole. The ignition assembly 120, the exhaust assembly 130, and the sealing ball tube body 110 form a closed whole.

[0057] The exhaust assembly 130 is composed of an exhaust end cover 131 and a bursting disc 132, which are fixed together by laser welding. The exhaust assembly 130 and the tube body 110 are fixed together by laser welding. The high-pressure inert mixed gas is injected into the tube body 110 from the gas injection hole 111 on the tube body 110. The sealing member 112 is a sealing ball, which is fixed to the tube body 110 by resistance welding.

[0058] Thus, the ignition assembly 120 and the exhaust assembly 130 of the mixed gas generator 100 are connected with the tube body 110 through interference hole shaft fitting, and are reliably connected through laser welding, so that the risk of gas leakage of the generator is avoided, and the manufacturing process requirement of the parts is reduced. In the ignition assembly 120, the sealing ring 126 is arranged between the electric detonator 123 and the base 121, so that the high-temperature and high-pressure gas generated when the electric detonator 123 is detonated is discharged from the end of the electric detonator 123, so that the electric detonator 123 cannot open the electric detonator container 124, and thus the ignition failure problem is caused; and the powder cup 125 and the electric detonator container 124 are reliably connected through laser welding, so that the powder cup 125 is prevented from flying out and causing ignition failure.

[0059] The use process of the automobile safety air bag adopting the mixed gas generator 100 is as follows:

[0060] The ignition powder 101 is placed in the powder cup 125, and a buffer pad 128 with many small holes is placed at the upper surface of the ignition powder 101, so as to fix the ignition powder 101 and prevent the ignition powder 101 from moving in the powder cup 125; the flow guide hole 129 in the buffer pad 128 is convenient for the high-temperature and high-pressure gas after the electric detonator 123 is detonated to pass through, and thus the ignition powder 101 is ignited.

[0061] When the collision signal is detected, the electric detonator 123 is electrified and detonated, the high-temperature and high-pressure gas generated opens the top end of the electric detonator container 124, the high-temperature and high-pressure gas enters the powder cup 125, and thus the ignition powder 101 is ignited, the high-temperature and high-pressure gas released by the ignition powder 101 further heats and pressurizes the mixed gas, when the pressure of the mixed gas is greater than the maximum pressure that the bursting disc 132 can bear, the bursting disc 132 is pierced, the high-pressure gas is discharged from the exhaust end cover 131, and thus the air bag of the automobile safety air bag is filled, so as to achieve the purpose of protecting the passengers. In order to facilitate opening of the top end of the electric detonator container 124, the top end is made into a cross-shaped groove shape.

[0062] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A mixed gas generator, characterized in that: The mixed gas generator includes a tube body, an ignition component and an exhaust component; The ignition component and the exhaust component are respectively connected to the two ends of the tube body, and the tube body is filled with high-pressure inert mixed gas; Wherein, the ignition component and the exhaust component are both interference-fitted with the tube body and are welded to corresponding ends of the tube body.

2. The mixed gas generator according to claim 1, characterized in that: The ignition assembly includes a base, a short-circuit socket, a squib, a squib container and a powder cup; The base is interference-fitted with the tube body and is welded to the tube body; the short-circuit socket and the electric squib are both connected to the base, and the short-circuit socket is electrically connected to the electric squib; the electric squib container cover is provided on the electric squib and is connected to the base, and the gunpowder cup is connected to the electric squib container; Wherein, the powder cup is filled with ignition powder.

3. The mixed gas generator according to claim 2, characterized in that: The squib container is connected to the base by welding, and the powder cup is connected to the squib container by welding.

4. The mixed gas generator according to claim 2, characterized in that: A sealing ring is provided between the contact surface of the electric squib and the base.

5. The mixed gas generator according to claim 4, characterized in that: The inner side of the base is folded to provide a pressing edge, the pressing edge is pressed against the outer periphery of the electric squib, and the sealing ring is located between the contact surface of the pressing edge and the electric squib.

6. The mixed gas generator according to claim 5, characterized in that: The pressing edge is located on the inner side of the squib container.

7. The mixed gas generator according to claim 2, characterized in that: The gunpowder cup has a built-in buffer pad, which is located at one end of the gunpowder cup close to the electric squib; along the direction from the electric squib to the gunpowder cup, the buffer pad is provided with a plurality of guide holes.

8. The mixed gas generator according to any one of claims 1 to 7, characterized in that: The exhaust assembly includes an exhaust end cover and a bursting disc. The exhaust end cover is interference-fitted with the tube body and is welded to the tube body. The bursting disc is welded to the inner side of the exhaust end cover.

9. The mixed gas generator according to any one of claims 1 to 7, characterized in that: An air injection hole is provided on the outer periphery of the tube body, and a sealing member is welded and connected to the air injection hole.

10. An automobile airbag, characterized in that: The automobile airbag comprises the mixed gas generator according to any one of claims 1 to 9.

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