Gas generator

Abstract

The invention relates to the technical field of gas generators, in particular to a gas generator. The gas generator comprises a first shell, a second shell and an ignition assembly. The first shell covers the second shell and forms an inner cavity together with the second shell, the first shell is connected with the second shell in a welding manner, and the first shell is provided with a mounting hole; the ignition assembly is connected to the first shell in an injection molding mode, and at least part of the ignition assembly extends into the inner cavity through the mounting hole. The gas generator is simple in assembly process, and the overall sealing performance and stability of the generator can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas generators, and in particular to a gas generator. Background Art

[0002] At present, in the process of assembling gas generators, the requirements for the dimensional consistency and injection molding process of spare parts are high. In addition, in the process of assembly, due to the complexity of the assembly process, quality problems are prone to occur, as well as poor stability in use and low product consistency. Summary of the invention

[0003] The purpose of the present invention includes providing a gas generator, which has a simple assembly process and can reduce the requirements for the dimensional consistency and injection molding process of the parts and components, thereby improving the assembly quality while also improving the overall sealing and stability of the generator.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] The present invention provides a gas generator, which includes a first shell, a second shell and an ignition assembly;

[0006] The first shell is covered with the second shell to form an inner cavity together, the first shell is welded to the second shell, and the first shell is provided with a mounting hole;

[0007] The ignition component is injection-moldedly connected to the first housing, and at least a portion of the ignition component extends into the inner cavity through the mounting hole.

[0008] In an optional embodiment, the ignition assembly includes an ignition housing, ignition powder, and an igniter;

[0009] The ignition shell is located in the inner cavity; the ignition powder is contained in the ignition shell; the igniter is against the ignition powder, and the electrode of the igniter extends from the mounting hole toward the outside of the inner cavity;

[0010] The ignition housing is connected to the igniter and the first housing through an injection-molded inner injection-molded body, and the portion of the igniter located outside the inner cavity is connected to the first housing through an injection-molded outer injection-molded body.

[0011] In an alternative embodiment, the electrode of the igniter is located in an at least partially curved extension within the outer molded body.

[0012] In an optional embodiment, the gas generator further comprises a filter disposed in the inner cavity;

[0013] The filter is located at the periphery of the ignition shell, and together with the ignition shell, encloses a gas-generating cavity in the inner cavity, wherein at least one gas-generating medicine is arranged in the gas-generating cavity.

[0014] In an optional embodiment, two ends of the filter along the axial direction thereof abut against the first shell and the second shell respectively, and a protrusion abutting against the first shell is provided on the outer periphery of the filter.

[0015] In an optional embodiment, the first shell is provided with a groove which is recessed toward the inside thereof, and the mounting hole is located at the bottom of the groove; and the outer injection molded body is located in the groove.

[0016] In an alternative embodiment, the side wall of the groove extends in a curved manner along its axis.

[0017] In an optional embodiment, anti-slip portions are provided on the inner and outer sides of the groove bottom or the side walls of the groove.

[0018] In an optional embodiment, the anti-slip portion includes a limit platform or an anti-slip groove.

[0019] In an optional embodiment, at least one clamping beam is disposed on the inner and outer sides of the groove bottom of the groove or on the sidewall of the groove.

[0020] The beneficial effects of the gas generator provided by the embodiment of the present invention include:

[0021] The gas generator comprises a first shell, a second shell and an ignition assembly; the first shell covers the second shell and together form an inner cavity, the first shell and the second shell are welded and connected, and the first shell is provided with a mounting hole; the ignition assembly is injection-molded and connected to the first shell, and at least part of the ignition assembly extends into the inner cavity through the mounting hole.

[0022] The gas generator adopts a method of welding the first shell and the second shell and injection molding the ignition component to the first shell, so that the generator as a whole can be sealed and fixed; based on this, compared with the existing technology, it can reduce the number of spare parts connected by injection molding, and eliminate the small weld welding and ignition device flanging processes in the existing assembly process, thereby reducing production energy consumption; therefore, the gas generator has a simple assembly process, can improve the strength of the generator, and has stable injection molding performance and good product consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A cross-sectional view of a gas generator provided for this embodiment;

[0025] Figure 2A schematic diagram of the structure of the gas generator provided in this embodiment from a first viewing angle;

[0026] Figure 3 A schematic diagram of the structure of the gas generator provided in this embodiment from a second viewing angle;

[0027] Figure 4 A cross-sectional view of the first housing and the ignition assembly provided in this embodiment;

[0028] Figure 5 A schematic diagram of the structure of the first housing and the ignition assembly provided in this embodiment;

[0029] Figure 6 A cross-sectional view of the first housing, ignition assembly and filter provided in this embodiment;

[0030] Figure 7 A cross-sectional view of the first shell provided in this embodiment.

[0031] Icons: 100-gas generator; 110-first shell; 120-second shell; 130-ignition assembly; 101-inner cavity; 111-mounting hole; 131-ignition shell; 132-igniter; 133-electrode; 134-fire transfer hole; 141-inner injection molding body; 142-outer injection molding body; 150-filter; 151-protrusion; 112-groove; 113-anti-slip portion; 114-anti-slip groove. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Please refer to Figure 1-Figure 5 , this embodiment provides a gas generator 100, the gas generator 100 includes a first shell 110, a second shell 120 and an ignition assembly 130;

[0039] The first shell 110 covers the second shell 120 and together form an inner cavity 101. The first shell 110 and the second shell 120 are welded and connected. The first shell 110 is configured with a mounting hole 111.

[0040] The ignition assembly 130 is injection-moldedly connected to the first housing 110 , and at least a portion of the ignition assembly 130 extends into the inner cavity 101 through the mounting hole 111 .

[0041] Please refer to Figure 1-Figure 5 , the working principle of the gas generator 100 is:

[0042] The gas generator 100 includes a first shell 110, a second shell 120 and an ignition assembly 130; the first shell 110 covers the second shell 120 and together form an inner cavity 101, the first shell 110 and the second shell 120 are welded and connected, and the first shell 110 is provided with a mounting hole 111; the ignition assembly 130 is injection-molded and connected to the first shell 110. Therefore, the gas generator 100 adopts a method of welding the first shell 110 and the second shell 120, and injecting the ignition assembly 130 to the first shell 110, so that the generator as a whole can be sealed and fixed;

[0043] Based on this, compared with the existing technology, it can reduce the number of parts connected by injection molding, and eliminate the small weld welding and ignition device flanging processes in the existing assembly process, thereby reducing production energy consumption; therefore, the gas generator 100 has a simple assembly process, can improve the strength of the generator, and has stable injection molding performance and good product consistency.

[0044] For further information, please refer to Figure 1-Figure 5 In this embodiment, when configuring the ignition assembly 130, the ignition assembly 130 includes an ignition housing 131, ignition powder and an igniter 132; wherein the ignition housing 131 is located in the inner cavity 101; the ignition powder is contained in the ignition housing 131; the igniter 132 abuts against the ignition powder, and the electrode 133 of the igniter 132 extends from the mounting hole 111 toward the outside of the inner cavity 101;

[0045] As can be seen from the foregoing, the ignition assembly 130 is connected to the first housing 110 by injection molding, and when configuring the ignition assembly 130, its igniter 132 needs to be electrically connected to the external structure, and its ignition housing 131 and the ignition powder in the ignition housing 131 are used to ignite under the action of the igniter 132, thereby causing the gas generating agent in the inner cavity 101 to work and generate gas;

[0046] Therefore, when configuring the ignition assembly 130, it is necessary to fix the ignition housing 131 of the ignition assembly 130 located in the inner cavity 101 and seal its connection, and it is also necessary to fix and seal its portion displaced outside the inner cavity 101;

[0047] On the basis that the ignition assembly 130 is connected to the first housing 110 by injection molding, the portion located in the inner cavity 101 after injection molding is defined as the inner injection molding body 141, and the portion located outside the inner cavity 101 is defined as the outer injection molding body 142;

[0048] Thus, the ignition housing 131 is connected to the igniter 132 and the first housing 110 through the injection-molded inner injection-molded body 141, and the portion of the igniter 132 outside the inner cavity 101 is connected to the first housing 110 through the injection-molded outer injection-molded body 142. That is, on the basis of the injection molding connection, the ignition housing 131 is connected and fixed by the inner injection-molded body 141 and the connection is sealed, while the portion of the igniter 132 outside the inner cavity 101 is connected and fixed by the outer injection-molded body 142 and the connection is sealed;

[0049] Since the inner injection-molded body 141 and the outer injection-molded body 142 are formed by one injection molding process, this embodiment can reduce the number of parts connected by injection molding and simplify the injection molding process steps, thereby improving the manufacturing efficiency.

[0050] In order to improve the stability of the portion of the igniter 132 that is displaced outside the inner cavity 101 and further enhance the stability of the injection molding, the electrode 133 of the igniter 132 is at least partially bent and extended within the outer injection molding body 142, that is, the electrode 133 includes a bent and extended portion and a straight extended portion.

[0051] For further information, please refer to Figure 1-Figure 6In this embodiment, the gas generator 100 further includes a filter 150 disposed in the inner cavity 101; the filter 150 is located at the periphery of the ignition shell 131, and together with the ignition shell 131 in the inner cavity 101, encloses a gas-producing cavity, and at least one gas-producing agent is placed in the gas-producing cavity. Moreover, based on the structure of the above-mentioned ignition component 130, a plurality of fire-transmitting holes 134 are evenly distributed on the periphery of the ignition shell 131, the purpose of which is that after the ignition agent is ignited, the high-temperature airflow generated by it can be quickly introduced into the gas-producing cavity, thereby effectively driving the gas-producing agent to produce gas.

[0052] When installing the filter 150, in order to simplify the installation process and improve its stability, the filter 150 is respectively abutted against the first shell 110 and the second shell 120 at both ends along the axial direction thereof, and a protrusion 151 abutting against the first shell 110 is provided on the outer periphery of the filter 150. In this way, the filter 150 can be installed and fixed, and the abutting contact or engagement between the protrusion 151 and the first shell 110 can also reduce its shaking in the inner cavity 101, thereby reducing its use noise.

[0053] For further information, please refer to Figure 1-Figure 7 In this embodiment, in order to improve the stability of the gas generator 100, when the ignition assembly 130 is connected to the first housing 110 by injection molding, in order to improve the installation stability of the various injection-molded structures and the ignition assembly 130, the first housing 110 is provided with a groove 112 that is recessed toward the inside thereof, and the mounting hole 111 is located at the bottom of the groove 112; the outer injection molding body 142 is located in the groove 112. Thus, through such a setting, the groove 112 can form a mutual cooperation with the outer injection molding body 142, and then in this way, the stability of the injection molding structure can be improved to prevent displacement or slippage.

[0054] In addition, when configuring the groove 112, the side wall of the groove 112 can be bent and extended along its axis. Taking the groove 112 as a cylindrical groove as an example, the inner diameter can be gradually reduced from the bottom of the groove to the groove mouth along the axial direction of the groove 112, that is, the inner diameter of the part close to the bottom of the groove is larger than the inner diameter of the part close to the groove mouth. The purpose is to enable the outer injection molded body 142 to have a shape that matches the groove 112 after being formed in the groove 112, and then to form a snap-fitting effect based on the shape change of the groove 112, thereby preventing the outer injection molded body 142 from detaching.

[0055] In addition, in the embodiment of the present invention, the inner and outer sides of the groove bottom of the groove 112 or the sidewalls of the groove 112 are provided with anti-detachment parts 113. That is, the anti-detachment parts 113 can also be provided on the groove bottom of the groove 112 or the groove wall thereof, and then the anti-detachment parts 113 are provided to increase the connection stability between the inner injection molded body 141 and the outer injection molded body 142 and the first housing 110;

[0056] It should be noted that, since the inner injection molded body 141 is arranged in the inner cavity 101 and connected to the outer side of the bottom of the groove 112, and the outer injection molded body 142 is arranged outside the inner cavity 101 and connected to the inner side of the bottom of the groove 112, and the side wall of the groove 112 is connected to the outer injection molded body 142; therefore, by arranging the anti-detachment part 113 on the inner side of the bottom of the groove 112 and the side wall of the groove 112, the stability of the outer injection molded body 142 can be increased, and by arranging the anti-detachment part 113 on the outer side of the groove 112, the stability of the inner injection molded body 141 can be increased.

[0057] When the anti-slipping part 113 is configured, it can be a stopper or an anti-slipping groove 114 arranged on the side wall, the inner side of the groove bottom or the outer side of the groove bottom of the groove 112. It should be noted that since the aforementioned anti-slipping part 113 is a structure arranged on the first shell 110, through the setting of the anti-slipping part 113, if it is set as a stopper, after the ignition component 130 is connected to the first shell 110 by injection molding, a groove body that matches the stopper can be formed at the position corresponding to the stopper of the inner injection molded body 141 and the outer injection molded body 142; similarly, if it is set as an anti-slipping groove 114, after the ignition component 130 is connected to the first shell 110 by injection molding, a boss that matches the anti-slipping groove 114 can be formed at the position corresponding to the anti-slipping groove 114 of the inner injection molded body 141 and the outer injection molded body 142, thereby improving the connection stability between the inner injection molded body 141 and the outer injection molded body 142 and the first shell 110.

[0058] On the basis of the above-mentioned anti-detachment portion 113, at least one clamping beam can be arranged on the inner and outer sides of the bottom of the groove 112 or the side wall of the groove 112, and the clamping beam is arranged at an angle with the connection between the groove 112, so that after the ignition component 130 and the first shell 110 are injection-molded and connected, a clamping groove that cooperates with the clamping beam can be formed at the position corresponding to the clamping beam of the inner injection-molded body 141 and the outer injection-molded body 142, thereby improving the connection stability between the inner injection-molded body 141 and the outer injection-molded body 142 and the first shell 110.

[0059] In summary, please refer to Figure 1-Figure 7 , the working principle of the gas generator 100 is:

[0060] When the ignition assembly 130 receives an electrical signal and is activated, the ignition charge in the combustion chamber in the ignition housing 131 is rapidly ignited;

[0061] After the ignition powder is ignited, the gas generating powder in the gas generating cavity can be driven to generate gas through the fire transfer hole 134 on the ignition housing 131;

[0062] The gas generated by the gas generating agent is filtered through the filter 150, enters the filter cavity, and finally enters the airbag through the vent hole on the first shell 110 or the second shell 120; wherein the vent hole is sealed from the inside with a metal sealing foil.

[0063] The gas generator 100 has at least the following advantages:

[0064] The assembly process is simple, and the generator can be sealed and fixed as a whole only by laser welding the first shell 110 and the second shell 120;

[0065] The production process is simplified. Compared with the prior art, only the two parts of the ignition assembly 130 and the first housing 110 need to be injection molded to achieve the effect of injection molding connection. At the same time, the use of injection molding can save the small weld welding and ignition device flanging process in the existing assembly process, thereby reducing production energy consumption;

[0066] To reduce the vibration noise of the generator, the filter 150 is provided with a protrusion 151 which can effectively hold the filter in place, thereby reducing the vibration noise of the parts in the generator;

[0067] To enhance the fixing effect of the injection molding body, an anti-detachment portion 113 and other structures are provided, and the electrode 133 of the ignition component 130 is not a straight tube, which can further enhance the fixing effect of the injection molding and reduce the vibration noise of the generator.

[0068] 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 gas generator, characterized in that: The gas generator comprises a first shell, a second shell and an ignition assembly; The first shell is covered with the second shell to form an inner cavity together, the first shell is welded to the second shell, and the first shell is provided with a mounting hole; The ignition component is injection-moldedly connected to the first shell, and at least a portion of the ignition component extends into the inner cavity through the mounting hole.

2. The gas generator according to claim 1, characterized in that: The ignition assembly includes an ignition housing, ignition powder and an igniter; The ignition shell is located in the inner cavity; the ignition powder is contained in the ignition shell; the igniter is against the ignition powder, and the electrode of the igniter extends from the mounting hole toward the outside of the inner cavity; The ignition housing is connected to the igniter and the first housing through an injection-molded inner injection-molded body, and the portion of the igniter located outside the inner cavity is connected to the first housing through an injection-molded outer injection-molded body.

3. The gas generator according to claim 2, characterized in that: The electrode of the igniter is located in at least a portion of the outer injection molded body and is bent and extended.

4. The gas generator according to claim 2, characterized in that: The gas generator further includes a filter disposed in the inner cavity; The filter is located at the periphery of the ignition shell, and together with the ignition shell, encloses a gas-generating cavity in the inner cavity. At least one gas-generating agent is placed in the gas-generating cavity.

5. The gas generator according to claim 4, characterized in that: The two ends of the filter along the axial direction thereof are respectively abutted against the first shell and the second shell, and a protrusion abutting against the first shell is provided on the outer periphery of the filter.

6. The gas generator according to claim 2, characterized in that: The first shell is provided with a groove which is sunken toward the inside thereof, the mounting hole is located at the bottom of the groove; and the outer injection molded body is located in the groove.

7. The gas generator according to claim 6, characterized in that: The side wall of the groove is bent and extended along the axis thereof.

8. The gas generator according to claim 6, characterized in that: Anti-slip portions are provided on the inner and outer sides of the groove bottom or the side walls of the groove.

9. The gas generator according to claim 8, characterized in that: The anti-slip portion includes a limiting platform or an anti-slip groove.

10. The gas generator according to claim 6, characterized in that: At least one clamping beam is arranged on the inner and outer sides of the groove bottom or the side wall of the groove.

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