Mixed gas generator and automobile safety air bag

Abstract

The invention relates to the technical field of gas generators, in particular to a mixed gas generator and an automobile safety airbag. 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 invention relates to the technical field of gas generators, and in particular to a mixed gas generator and an automobile safety airbag. Background Art

[0002] As the core component of automobile airbags, automobile airbag gas generators receive collision signals and generate appropriate amounts of gas at appropriate speeds and mass flow rates to fill airbags, thereby protecting drivers and passengers.

[0003] However, the existing automobile airbag gas generators have relatively high process requirements during the manufacturing process, and are prone to poor fitting and substandard sealing during manufacturing. Since high-pressure gas is stored inside, if there are sealing defects, it is likely to cause the high-pressure gas to leak slowly, causing the generator to fail. Summary of the invention

[0004] The purpose of the present invention includes providing a mixed gas generator and a car airbag, which have a simple structure, are easy to install, have good sealing performance, and are stable and reliable. They can also reduce the requirements for the manufacturing process and precision of parts, thereby reducing the cost of production and use.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides a mixed gas generator, the mixed gas generator comprising a tube body, an ignition component and an exhaust component;

[0007] 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;

[0008] The ignition component and the exhaust component are both interference-fitted with the tube body and are welded to the corresponding ends of the tube body.

[0009] In an optional embodiment, the ignition assembly includes a base, a short-circuit socket, a squib, a squib container, and a powder cup;

[0010] The base is interference fit 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 arranged on the electric squib and is connected to the base, and the gunpowder cup is connected to the electric squib container;

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

[0012] In an optional embodiment, the squib container is connected to the base by welding, and the powder cup is connected to the squib container by welding.

[0013] In an optional embodiment, a sealing ring is provided between the contact surface between the electric squib and the base.

[0014] In an optional embodiment, a pressing edge is provided on the inner fold of the base, 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.

[0015] In an optional embodiment, the pressing edge is located on the inner side of the squib container.

[0016] In an optional embodiment, a buffer pad is built into the gunpowder cup, and the buffer pad 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.

[0017] In an optional embodiment, the exhaust assembly includes an exhaust end cover and a bursting disc, the exhaust end cover is interference fit 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.

[0018] In an optional embodiment, 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.

[0019] In a second aspect, the present invention provides an automobile airbag, which includes the above-mentioned mixed gas generator.

[0020] The beneficial effects of the mixed gas generator and automobile airbag provided by the embodiments of the present invention include:

[0021] 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 fit with the tube body, and are welded to the corresponding ends of the tube body. The mixed gas generator has a simple structure, is easy to install, has good sealing, and is stable and reliable. It can also reduce the requirements for the manufacturing process and precision of the parts, thereby reducing the cost of production and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the mixed gas generator provided in this embodiment;

[0024] Figure 2 A schematic diagram of the structure of the tube body and the ignition assembly provided in this embodiment;

[0025] Figure 3This is a schematic diagram of the structure of the pipe body and exhaust assembly provided in this embodiment.

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

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0033] The inventor has found through research that during the assembly process of the existing generator, the exhaust cover is welded to the connecting block, and the connecting block is welded to the tube body, and the welding contact form is surface-to-surface contact; however, whether the exhaust cover and the connecting block are interference fit or clearance fit, the welding 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. In addition, 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 leak slowly, causing the generator to fail.

[0034] The electric squib and the ignition part at the ignition end are hard-connected, which will cause high-temperature and high-pressure gas to leak from the connection when the electric squib is ignited, causing the top of the ignition part to be unable to be opened, resulting in ignition failure. The high-pressure gas cannot open the bursting disc, and the generator cannot work properly. In addition, the gunpowder cup and the connecting parts are threaded. For a generator with a general life of more than 15 years, the threaded connection here is not so stable and reliable, and there is a risk of failure and falling off. When the electric squib is working, it is possible to impact and disengage the gunpowder cup, causing ignition failure and the generator cannot work properly.

[0035] For the above reasons, please refer to Figure 1-Figure 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 Figure 1-Figure 3 , the working principle of the mixed gas generator 100 is:

[0039] The mixed gas generator 100 includes a tube body 110, an ignition component 120 and an exhaust component 130; the ignition component 120 and the exhaust component 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 component 120 and the exhaust component 130 are both interference fit with the tube body 110, and are welded to the corresponding ends of the tube body 110.

[0040] Therefore, during the manufacturing and assembly process of the mixed gas generator 100, the ignition component 120 and the exhaust component 130 are interference fit with the tube body 110, and then welded together. In this way, the requirements for the manufacturing process and precision of the spare parts can be reduced, thereby reducing the cost of manufacturing and use. Moreover, such interference fit and laser welding connection methods can not only simplify its structure and facilitate its assembly, but also improve its woodiness and stability.

[0041] For further information, please refer to Figure 1-Figure 3 In this embodiment, the ignition assembly 120 includes a base 121, a short-circuit socket 122, an electric squib 123, an electric squib container 124 and a gunpowder cup 125;

[0042] Base 121 is interference fit with tube body 110 and is welded to tube body 110; short-circuit socket 122 and electric squib 123 are both connected to base 121, and short-circuit socket 122 is electrically connected to electric squib 123; squib container 124 is covered on squib 123 and connected to base 121, and powder cup 125 is connected to squib container 124; powder cup 125 is filled with ignition powder 101.

[0043] Therefore, when installing ignition component 120, base 121 is interference fit with tube body 110 and tube body 110 is connected by laser welding, which can reduce the process and precision requirements of base 121 in the manufacturing process, thereby simplifying the cost of its manufacturing and use; on this basis, short-circuit socket 122 and electric squib 123 are connected to base 121, and squib container and gunpowder cup 125 are installed; wherein, since short-circuit socket 122 needs to be connected to an external structure, therefore, when short-circuit socket 122 and electric squib 123 are connected to base 121, short-circuit socket 122 is connected to one end of base 121 facing outside of tube body 110, and squib 123 is connected to one end of base 121 located inside tube body 110, so as to facilitate connecting squib container 124 to base 121 and covering it on squib 123.

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

[0045] It should be noted that in this embodiment, the welding connections referred to in the entire text can all be laser welding.

[0046] During use, since electric squib 123 is connected to base 121, and electric squib container 124 is covered on electric squib 123 and connected to base 121, in order to prevent the gas inside tube body 110 from leaking through the gap between electric squib 123 and base 121, a sealing ring 126 is provided between the contact surfaces of electric squib 123 and base 121.

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

[0048] Through such a setting, the stability of the structure can be improved, so that base 121, squib 123 and squib 123 base 121 can form an integral structure, and after the gunpowder cup 125 is connected to the squib container 124, the installation stability of the overall structure of the ignition assembly 120 is improved.

[0049] In addition, in order to improve the stability of the ignition powder 101 in the gunpowder cup 125 and enable the high-temperature airflow generated by the electric squib 123 to be introduced into the gunpowder cup 125 during use to ignite the ignition powder 101 in the gunpowder cup 125, a buffer pad 128 is built into the gunpowder cup 125, and the buffer pad 128 is located at one end of the gunpowder cup 125 close to the electric squib 123; along the direction from the electric squib 123 to the gunpowder cup 125, the buffer pad 128 is provided with a plurality of guide holes 129. As a result, the high-temperature airflow generated by the electric squib 123 when the short-circuit socket 122 is powered on can be introduced into the gunpowder cup 125 through the plurality of guide holes 129.

[0050] When configuring the exhaust assembly 130, please refer to Figure 1-Figure 3 In this embodiment, the exhaust assembly 130 includes an exhaust end cover 131 and a bursting disc 132. The exhaust end cover 131 is interference-fitted with the pipe body 110 and welded to the pipe body 110; the bursting disc 132 is welded to the inner side of the exhaust end cover 131. In this way, the structural process and precision requirements of the exhaust assembly 130 are reduced, and its sealing 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 provided 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 it, thereby preventing the inert gas from leaking.

[0052] Based on the above-mentioned mixed gas generator 100, please refer to Figure 1-Figure 3 This embodiment also provides an automobile safety airbag, which includes the above-mentioned mixed gas generator 100. By adopting the above-mentioned mixed gas generator 100, it can not only improve its sealing performance and use stability, but also simplify its structure and manufacturing requirements, thereby reducing its manufacturing cost.

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

[0054] The powder cup 125 and the squib container 124 are fixed together by laser welding, and there are small holes at the bottom of the powder cup 125 to facilitate heat transfer;

[0055] A sealing ring 126 is provided between the electric squib 123 and the base 121, and a pressing edge 127 is formed by folding the inner edge of the base 121, so that the electric squib 123, the sealing ring 126 and the base 121 are tightly pressed together by the pressing edge 127 to form a reliable seal, thereby preventing gas from leaking from the electric squib 123 when the electric squib 123 is exploding;

[0056] The squib container 124 and the base 121 are fixed together by laser welding, and the squib container 124, the base 121, the squib 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 together with the tube body 110 by resistance welding.

[0058] Therefore, the ignition assembly 120 and the exhaust assembly 130 of the mixed gas generator 100 are connected to the tube body 110 through the interference fit of the hole and shaft, and then the two are reliably connected by laser welding, thereby avoiding the risk of gas leakage of the generator and reducing the manufacturing process requirements for the parts. In the ignition assembly 120, a sealing ring 126 is added between the electric squib 123 and the base 121 to prevent the high-temperature and high-pressure gas generated when the electric squib 123 is detonated from being discharged from the end of the electric squib 123, thereby causing the electric squib 123 to be unable to open the electric squib container 124, thereby causing the problem of ignition failure; and the gunpowder cup 125 and the electric squib container 124 are reliably connected by laser welding to prevent the gunpowder cup 125 from flying out and causing ignition failure.

[0059] The use process of the automobile safety airbag using the mixed gas generator 100 is as follows:

[0060] The ignition powder 101 is placed in the gunpowder cup 125, and a buffer pad 128 with many small holes is placed on the upper surface of the ignition powder 101 to fix the ignition powder 101 and prevent the ignition powder 101 from moving in the gunpowder cup 125; the guide holes 129 in the buffer pad 128 are to facilitate the high-temperature and high-pressure gas after the electric squib 123 is ignited to pass smoothly, thereby igniting the ignition powder 101.

[0061] When the collision signal is detected, the electric squib 123 is energized and ignited, and the high-temperature and high-pressure gas generated opens the top of the electric squib container 124, and the high-temperature and high-pressure gas enters the gunpowder cup 125, and then ignites the ignition powder 101. The high-temperature and high-pressure gas released by the combustion of the ignition powder 101 further heats and pressurizes the mixed gas. When the mixed gas pressure is greater than the maximum pressure that the bursting disc 132 can withstand, the bursting disc 132 is punctured, and the high-pressure gas is discharged from the exhaust end cover 131, and then fills the airbag of the automobile safety airbag to achieve the purpose of protecting the occupants. Among them, in order to facilitate the opening of the top of the electric squib container 124, its top is made into a cross-grooved shape.

[0062] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A mixed gas generator, characterized in that: The mixed gas generator comprises 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 the corresponding ends of the tube body.

2. The mixed gas generator according to claim 1, characterized in that: The ignition assembly comprises a base, a short-circuit socket, a squib, a squib container and a powder cup; The base is interference fit 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 disposed on the electric squib and is connected to the base, and the gunpowder cup is connected to the electric squib container; Wherein, the gunpowder cup is filled with ignition powder.

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

4. The mixed gas generator according to claim 2, characterized in that: A sealing ring is arranged 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 electric 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 comprises an exhaust end cover and a bursting disc. The exhaust end cover is interference fit 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: The outer periphery of the tube body is provided with air injection holes, and a sealing member is welded and connected to the air injection holes.

10. An automobile airbag, characterized in that: The automobile safety airbag comprises the mixed gas generator as claimed in any one of claims 1-9.

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