Gas generator

Abstract

The utility model 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] This utility model relates to the field of gas generator technology, and more specifically, to a gas generator. Background Technology

[0002] Currently, the assembly process of gas generators has high requirements for the dimensional consistency of parts and injection molding process. Moreover, due to the complexity of the assembly process, quality problems, poor stability in use, and low product consistency are prone to occur. Utility Model Content

[0003] The purpose of this utility model is to provide a gas generator with a simple assembly process, which can reduce the requirements for the dimensional consistency of parts and injection molding process, thereby improving the overall sealing and stability of the generator while improving its assembly quality.

[0004] The embodiments of this utility model can be implemented as follows:

[0005] This utility model provides a gas generator, which includes a first housing, a second housing, and an ignition assembly;

[0006] The first housing covers the second housing and together they form an inner cavity. The first housing and the second housing are welded together. The first housing is provided with mounting holes.

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

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

[0009] The ignition housing is located in the inner cavity; the ignition propellant is contained in the ignition housing; the igniter and the ignition propellant abut against each other, 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 via an injection-molded inner body, and the portion of the igniter located outside the inner cavity is connected to the first housing via an injection-molded outer body.

[0011] In an alternative embodiment, the electrodes of the igniter are located within at least a portion of the outer injection molding body, which are bent and extended.

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

[0013] The filter is located on the periphery of the ignition housing and together with the ignition housing in the inner cavity forms a gas-generating chamber, which contains at least one gas-generating agent.

[0014] In an optional embodiment, the filter abuts against the first housing and the second housing at both ends along its axial direction, and the outer periphery of the filter is provided with a protrusion that abuts against the first housing.

[0015] In an alternative embodiment, the first housing is provided with a recessed groove facing inwards, and a mounting hole is located at the bottom of the groove; the outer injection body is located within the groove.

[0016] In an alternative embodiment, the sidewalls of the groove extend in a curved manner along its axis.

[0017] In an optional embodiment, anti-detachment parts are provided on the inner and outer sides of the groove bottom or on the sidewall of the groove.

[0018] In an optional embodiment, the anti-detachment part includes a limiting platform or an anti-detachment groove.

[0019] In an optional embodiment, at least one retaining beam is provided on the inner or outer side of the groove bottom or on the sidewall of the groove.

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

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

[0022] This gas generator employs a method of welding the first and second housings together and injection molding the ignition assembly to the first housing, thus sealing and fixing the entire generator. Compared to existing technologies, this reduces the number of injection-molded parts and eliminates the need for small weld seams and ignition device flanging processes in existing assembly processes, thereby reducing production energy consumption. Consequently, this gas generator has a simple assembly process, improves generator strength, and exhibits stable injection molding performance and good product consistency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the gas generator provided in this embodiment;

[0025] Figure 2This is a schematic diagram of the gas generator from a first-view perspective provided in this embodiment;

[0026] Figure 3 This is a schematic diagram of the gas generator provided in this embodiment from a second perspective.

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

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

[0029] Figure 6 This is 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 housing provided for this embodiment.

[0031] Icons: 100-Gas generator; 110-First housing; 120-Second housing; 130-Ignition assembly; 101-Inner cavity; 111-Mounting hole; 131-Ignition housing; 132-Igniter; 133-Electrode; 134-Ignition port; 141-Inner injection body; 142-Outer injection body; 150-Filter; 151-Protrusion; 112-Groove; 113-Anti-detachment part; 114-Anti-detachment groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0038] Please refer to Figures 1-5 This embodiment provides a gas generator 100, which includes a first housing 110, a second housing 120, and an ignition assembly 130.

[0039] The first housing 110 covers the second housing 120 and together form the inner cavity 101. The first housing 110 and the second housing 120 are welded together. The first housing 110 is provided with mounting holes 111.

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

[0041] Please refer to Figures 1-5 The working principle of the gas generator 100 is as follows:

[0042] The gas generator 100 includes a first housing 110, a second housing 120, and an ignition assembly 130. The first housing 110 covers the second housing 120 and together form an inner cavity 101. The first housing 110 and the second housing 120 are welded together, and the first housing 110 is provided with mounting holes 111. The ignition assembly 130 is injection molded and connected to the first housing 110. Thus, by welding the first housing 110 and the second housing 120 together and injection molding the ignition assembly 130 to the first housing 110, the gas generator 100 can be sealed and fixed as a whole.

[0043] Based on this, compared with existing technologies, it can reduce the number of parts for injection molding connections and eliminate the small weld seam welding and ignition device flanging process in existing assembly processes, 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] Further, please refer to Figures 1-5 In this embodiment, when the ignition assembly 130 is configured, the ignition assembly 130 includes an ignition housing 131, an ignition propellant, and an igniter 132; wherein, the ignition housing 131 is located in the inner cavity 101; the ignition propellant is contained in the ignition housing 131; the igniter 132 abuts against the ignition propellant, 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. When the ignition assembly 130 is configured, its igniter 132 needs to be electrically connected to the external structure. Its ignition housing 131 and the ignition propellant inside 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 located in the inner cavity 101 of the ignition assembly 130, seal its connection, and fix and seal the part of it that is displaced outside the inner cavity 101.

[0047] Based on the ignition assembly 130 being connected to the first housing 110 by injection molding, the part located in the inner cavity 101 after injection molding is defined as the inner injection molded body 141, and the part located outside the inner cavity 101 is defined as the outer injection molded body 142.

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

[0049] Since the inner injection molded body 141 and the outer injection molded body 142 are formed by a single injection molding process, this embodiment can reduce the number of parts for injection molding connection, simplify the injection molding process steps, and thus improve its manufacturing efficiency.

[0050] In order to improve the stability of the portion outside the displacement cavity 101 of the igniter 132 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 body 142, that is, the electrode 133 includes a bent and extended portion as well as a straight extended portion.

[0051] Further, please refer to Figures 1-6In this embodiment, the gas generator 100 further includes a filter 150 disposed in the inner cavity 101. The filter 150 is located on the periphery of the ignition housing 131 and together with the ignition housing 131 in the inner cavity 101, forms a gas-generating chamber, which contains at least one gas-generating agent. Furthermore, based on the structure of the ignition assembly 130 described above, a plurality of ignition holes 134 are evenly distributed on the outer periphery of the ignition housing 131. The purpose of this is to allow the high-temperature gas flow generated after the ignition agent is ignited to be quickly introduced into the gas-generating chamber, thereby effectively driving the gas-generating agent to generate gas.

[0052] To simplify the installation process and improve stability when installing the filter 150, both ends of the filter 150 along its axial direction abut against the first housing 110 and the second housing 120, respectively. Furthermore, the outer periphery of the filter 150 is provided with a protrusion 151 that abuts against the first housing 110. This design not only secures the filter 150 but also reduces its movement within the inner cavity 101 through the abutting contact or locking action between the protrusion 151 and the first housing 110, thereby reducing operating noise.

[0053] Further, please refer to Figures 1-7 In this embodiment, to improve the operational stability of the gas generator 100, when the ignition assembly 130 is connected to the first housing 110 by injection molding as described above, to improve the installation stability of the various structures formed by injection molding and the ignition assembly 130, the first housing 110 is provided with a recessed groove 112 facing inward, and the mounting hole 111 is located at the bottom of the groove 112; the outer injection molded body 142 is located inside the groove 112. Thus, through this arrangement, the groove 112 and the outer injection molded body 142 can cooperate with each other, thereby improving the stability of the injection molded structure and preventing displacement or slippage.

[0054] In addition, when configuring the groove 112, the sidewall 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 of the groove 112 can be gradually reduced from the bottom to the opening along the axial direction of the groove. That is, the inner diameter of the part near the bottom of the groove is larger than the inner diameter of the part near the opening. 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, so that it can form a locking effect based on the shape change of the groove 112, thereby preventing the outer injection molded body 142 from falling off.

[0055] Furthermore, in embodiments of this utility model, anti-detachment portions 113 are provided on the inner and outer sides of the bottom of the groove 112 or on the sidewall of the groove 112. That is, anti-detachment portions 113 can also be provided on the bottom of the groove 112 or on its sidewall, thereby increasing the connection stability between the inner injection molded body 141 and the outer injection molded body 142 and the first housing 110 through the provision of anti-detachment portions 113;

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

[0057] When configuring the anti-detachment part 113, it can be a limiting platform or anti-detachment groove 114 provided on the side wall, inner side of the groove bottom, or outer side of the groove bottom of the groove 112. It should be noted that since the aforementioned anti-detachment part 113 is a structure provided on the first housing 110, by setting the anti-detachment part 113 as a limiting platform, after the ignition assembly 130 is injection molded and connected to the first housing 110, grooves that cooperate with the limiting platform can be formed at the positions corresponding to the limiting platform of the inner injection molded body 141 and the outer injection molded body 142; similarly, if it is set as an anti-detachment groove 114, after the ignition assembly 130 is injection molded and connected to the first housing 110, bosses that cooperate with the anti-detachment groove 114 can be formed at the positions corresponding to the anti-detachment 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 housing 110.

[0058] Based on the aforementioned anti-detachment part 113, at least one retaining beam can be provided on the inner or outer side of the bottom of the groove 112 or on the side wall of the groove 112. The retaining beam is set at an angle to the connection with the groove 112. After the ignition assembly 130 is injection molded and connected to the first housing 110, a retaining groove that cooperates with the retaining beam can be formed at the position corresponding to the retaining beam of the inner injection molded body 141 and the outer injection molded body 142. This can improve the connection stability between the inner injection molded body 141 and the outer injection molded body 142 and the first housing 110.

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

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

[0061] After the ignition charge is ignited, it can drive the gas-generating agent in the gas-generating chamber to generate gas through the ignition hole 134 on the ignition housing 131.

[0062] The gas generated by the gas-producing drug is filtered through filter 150 and enters the filter chamber. Finally, it enters the air bag through the vent on the first housing 110 or the second housing 120. The vent 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; only laser welding of the first housing 110 and the second housing 120 is required to seal and fix the generator as a whole.

[0065] The production process is simplified. Compared with the existing technology, only two parts, injection molding ignition component 130 and first housing 110, are needed to achieve the effect of injection molding connection. At the same time, injection molding can eliminate the small weld seam welding and ignition device flanging process in the existing assembly process, reducing production energy consumption.

[0066] To reduce generator vibration and noise, the filter 150 is provided with a protrusion 151 that can be effectively locked inside, thereby reducing the vibration and noise of the parts in the generator.

[0067] To enhance the fixing effect of the injection molded body, it is equipped with structures such as the anti-detachment part 113, and the electrode 133 of the ignition assembly 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 merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A gas generator, characterized in that: The gas generator includes a first housing, a second housing, and an ignition assembly; The first housing covers the second housing and together form an inner cavity. The first housing and the second housing are welded together. The first housing is provided with mounting holes. The ignition assembly is injection molded to the first housing, and at least a portion of the ignition assembly extends into the inner cavity through the mounting hole; The ignition assembly includes an ignition housing, an ignition propellant, and an igniter; The ignition housing is located in the inner cavity; the ignition propellant is contained in the ignition housing; the igniter abuts against the ignition propellant, 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 via an injection-molded inner body, and the portion of the igniter located outside the inner cavity is connected to the first housing via an injection-molded outer body.

2. The gas generator according to claim 1, characterized in that: The electrodes of the igniter are located in at least a portion of the outer injection molded body, which are bent and extended.

3. The gas generator according to claim 1, characterized in that: The gas generator also includes a filter disposed in the inner cavity; The filter is located on the periphery of the ignition housing and together with the ignition housing in the inner cavity forms a gas-generating chamber, the gas-generating chamber containing at least one gas-generating agent.

4. The gas generator according to claim 3, characterized in that: The filter abuts against the first housing and the second housing at both ends along its axial direction, and the outer periphery of the filter is provided with a protrusion that abuts against the first housing.

5. The gas generator according to claim 1, characterized in that: The first housing is provided with a recessed groove facing inwards, and the mounting hole is located at the bottom of the groove; the external injection molded body is located within the groove.

6. The gas generator according to claim 5, characterized in that: The sidewalls of the groove extend in a curved manner along its axis.

7. The gas generator according to claim 5, characterized in that: The groove bottom is provided with anti-detachment parts on the inner and outer sides or the sidewall of the groove.

8. The gas generator according to claim 7, characterized in that: The anti-detachment part includes a limiting platform or an anti-detachment groove.

9. The gas generator according to claim 5, characterized in that: At least one retaining beam is provided on the inner or outer side of the bottom of the groove or on the side wall of the groove.

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