Gas generator

Abstract

The utility model relates to the technical field of automobile safety air bag, concretely relates to a gas generator. The gas generator includes main body, injection molding spare, ignition subassembly and filter spare, the main body is equipped with inner chamber, injection molding spare is connected with the main body, and its at least partial intrudes into the inner chamber, and will the inner chamber divide into ignition chamber and gas production chamber, the ignition chamber is used for filling the fire -transmitting medicine, and the gas production chamber is used for filling the gas generating agent, the part of injection molding spare in the inner chamber is opened and has the ignition hole that will ignite the chamber and gas production chamber intercommunication, ignition subassembly is placed in injection molding spare, and the ignition end of ignition subassembly extends to the ignition chamber, and the pin end of ignition subassembly extends to the main body outside through injection molding spare. The gas generator can realize the component of spare parts, simplify the structure, reduce the welding connection, guarantee good closed environment simultaneously, improve its reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive airbag technology, and more specifically, to a gas generator. Background Technology

[0002] In automotive airbag systems, the gas generator is a key component. Its function is to rapidly generate a large amount of gas in emergencies such as vehicle collisions, causing the airbag to inflate quickly and thus protecting occupants. Existing gas generators suffer from complex connections and fixing methods between components, leading to a cumbersome assembly process requiring multiple connection techniques, increasing manufacturing and time costs. Furthermore, welding is commonly used for connections during manufacturing; however, welding processes demand high skill levels from equipment and operators, and consistent welding quality is difficult to guarantee, easily resulting in problems such as incomplete welds and missed welds, which in turn affect the sealing performance and overall strength of the gas generator. Utility Model Content

[0003] The purpose of this invention is to provide a gas generator that enables modularization of components, simplifies the structure, reduces welding connections, and ensures a good enclosed environment, thereby improving its reliability.

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

[0005] This utility model provides a gas generator, which includes a main body, an injection molded part, an ignition assembly, and a filter element;

[0006] The main body is equipped with an inner cavity, and the injection molded part is connected to the main body, with at least a portion of it extending into the inner cavity, dividing the inner cavity into an ignition chamber and a gas generation chamber; the ignition chamber is used to fill the ignition propellant, and the gas generation chamber is used to fill the gas generating agent;

[0007] The injection molded part has an ignition hole in the inner cavity that connects the ignition chamber and the gas generation chamber.

[0008] The ignition assembly is placed inside the injection molded part, and the ignition end of the ignition assembly extends into the ignition chamber, while the pin end of the ignition assembly extends through the injection molded part to the outside of the main body.

[0009] In an optional embodiment, the main body includes a first housing and a second housing connected to the first housing, the first housing and the second housing together forming an inner cavity;

[0010] The injection molded part is connected to the second housing, and the pin end of the ignition assembly extends out from the second housing.

[0011] In an optional embodiment, the injection molded part includes a first portion and a second portion, the first portion being connected to the second portion; the first portion is located in the inner cavity and forms the ignition chamber; the second portion is connected to the second housing.

[0012] The ignition end extends through the first section into the ignition chamber, and the pin end extends through the second section into the outside of the second housing.

[0013] In an optional embodiment, the second housing includes a recess that tapers inward toward the inner cavity, and a passage is provided at the bottom of the recess;

[0014] The second section is housed within the groove, and a portion of the second section passes through the opening and connects to the first section.

[0015] In an alternative embodiment, the diameter of the groove gradually increases along the direction from the groove opening to its bottom.

[0016] In an optional embodiment, a first limiting groove that mates with the first portion is disposed on the outer side of the groove bottom, and a second limiting groove that mates with the second portion is disposed on the inner side of the groove bottom.

[0017] In an optional embodiment, the first portion is open at one end away from the second portion, and a cap is installed at the open end.

[0018] In an optional embodiment, the filter element is spaced apart from the inner wall of the cavity, and the first housing has multiple vent holes on the portion opposite the filter element.

[0019] In an optional embodiment, a foil sheet is provided at the gap between the filter element and the inner wall of the inner cavity to block the exhaust hole.

[0020] In an optional embodiment, a plug connected to the filter element is provided in the inner cavity, the plug being used to seal the end of the filter element facing the first housing.

[0021] The beneficial effects of the gas generator provided in this embodiment of the present invention include:

[0022] The gas generator includes a main body, an injection-molded part, an ignition assembly, and a filter. The main body has an inner cavity, and the injection-molded part is connected to the main body, with at least a portion extending into the inner cavity, dividing the inner cavity into an ignition chamber and a gas-generating chamber. The ignition chamber is filled with a propellant, and the gas-generating chamber is filled with a gas-generating agent. An ignition hole connecting the ignition chamber and the gas-generating chamber is provided in the portion of the injection-molded part located within the inner cavity. The ignition assembly is placed within the injection-molded part, with its ignition end extending into the ignition chamber and its pin end extending through the injection-molded part to the outside of the main body. This gas generator enables modular component design, simplifies the structure, reduces welding connections, and ensures a good sealed environment, thereby improving its reliability. 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 schematic diagram of the gas generator provided in this embodiment;

[0025] Figure 2 This is a structural schematic diagram of the main body, injection molded part, and ignition assembly provided in this embodiment;

[0026] Figure 3 This is a schematic diagram of the structure of the injection molded part and ignition assembly provided in this embodiment;

[0027] Figure 4 This is a schematic diagram of the ignition hole configuration provided in this embodiment, where A is an opening reserved during injection molding, B is a groove reserved during injection molding, and C is a countersunk hole reserved during injection molding.

[0028] Figure 5 This is a schematic diagram of the structure of the second housing provided in this embodiment;

[0029] Figure 6 This is a structural schematic diagram of the main body, injection molded part, and ignition assembly provided for another embodiment of the present utility model.

[0030] Icons: 100-Gas generator; 110-Main body; 120-Injection molded part; 130-Ignition assembly; 140-Filter element; 111-Inner cavity; 112-Ignition chamber; 113-Gas generation chamber; 150-Flame; 160-Gas generating agent; 121-Ignition hole; 131-Ignition end; 132-Pin end; 114-First housing; 115-Second housing; 122-First section; 123-Second section; 116-Groove; 117-Pass through port; 118-First limiting groove; 119-Second limiting groove; 170-Cap; 180-Foil; 190-Plug. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] 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.

[0037] Please refer to Figures 1-3 This embodiment provides a gas generator 100, which includes a main body 110, an injection molded part 120, an ignition assembly 130, and a filter 140.

[0038] The main body 110 is provided with an inner cavity 111. The injection molded part 120 is connected to the main body 110 and at least partially extends into the inner cavity 111, dividing the inner cavity 111 into an ignition chamber 112 and a gas generating chamber 113. The ignition chamber 112 is used to fill the ignition propellant 150, and the gas generating chamber 113 is used to fill the gas generating agent 160.

[0039] The injection molded part 120 has an ignition hole 121 in the inner cavity 111 that connects the ignition chamber 112 and the gas generation chamber 113.

[0040] The ignition assembly 130 is placed inside the injection molded part 120, and the ignition end 131 of the ignition assembly 130 extends into the ignition chamber 112, while the pin end 132 of the ignition assembly 130 extends through the injection molded part 120 to the outside of the main body 110.

[0041] Please refer to Figures 1-3 The working principle of the gas generator 100 is as follows:

[0042] The gas generator 100 includes a main body 110, an injection molded part 120, an ignition assembly 130, and a filter 140; the main body 110 is provided with an inner cavity 111, the injection molded part 120 is connected to the main body 110 and at least partially extends into the inner cavity 111, and divides the inner cavity 111 into an ignition chamber 112 and a gas generation chamber 113.

[0043] Ignition chamber 112 is filled with ignition propellant 150, and gas generating chamber 113 is filled with gas generating agent 160. The portion of injection molded part 120 located in the inner cavity 111 has an ignition hole 121 that connects ignition chamber 112 and gas generating chamber 113. Ignition assembly 130 is placed inside injection molded part 120, and the ignition end 131 of ignition assembly 130 extends into ignition chamber 112, and the pin end 132 of ignition assembly 130 extends through injection molded part 120 to the outside of main body 110. The ignition chamber 112 is filled with ignition propellant 150, which is in direct contact with the ignition end 131. When working, the ignition propellant 150 in ignition chamber 112 can communicate with the gas generating agent 160 in gas generating chamber 113 through ignition hole 121.

[0044] With the above-described structural design, the gas generator 100 can be assembled by using the injection-molded part 120, which can separate the ignition chamber 112 and the gas production chamber 113 in the inner cavity 111 and also allow the installation of the ignition assembly 130. This simplifies the structure of the gas generator 100. Moreover, this design allows for assembly by injection molding, which reduces the welding process during assembly and ensures the overall sealing of the structure.

[0045] Thus, the gas generator 100 can achieve modularization of components, simplify the structure, reduce welding connections, and at the same time ensure a good closed environment, thereby improving its reliability.

[0046] It should be noted that, as can be seen from the above, the ignition assembly 130 is connected to the main body 110 through the injection molded part 120. Based on this, in order to facilitate the setting of its pin end 132, the injection molded part 120 is provided with a recessed cup-shaped groove that is recessed in the direction of the inner cavity 111, and the pin end 132 is located in the recessed cup-shaped groove so as to facilitate its connection with the external structure.

[0047] Additionally, please refer to Figures 1-4 Ignition hole 121 is the opening connecting ignition chamber 112 and gas production chamber 113 when gas generator 100 is working. Ignition hole 121 is an opening left in injection molded part 120 during injection molding (e.g., Figure 4 (as shown in A), or a groove left on the side wall of the injection molded part 120 during injection molding (such as... Figure 4(as shown in B in the figure), or a countersunk hole left on the side wall of the injection molded part 120 during injection molding (such as... Figure 4 As shown in C), it is opened to form an opening when in operation.

[0048] Further, please refer to Figures 1-5 In this embodiment, when configuring the main body 110, a combined structural arrangement is adopted. Specifically, the main body 110 includes a first housing 114 and a second housing 115 connected to the first housing 114. The first housing 114 and the second housing 115 together form an inner cavity 111. The injection molded part 120 is connected to the second housing 115, and the pin end 132 of the ignition assembly 130 extends out from the second housing 115. As can be seen from the foregoing, when configuring the injection molded part 120, the function of the injection molded part 120 is to install the ignition assembly 130 and to separate the ignition chamber 112 and the gas generation chamber 113 in the inner cavity 111. This method can simplify the installation steps and reduce the welding process. Moreover, the injection molding method can also improve its overall sealing performance. Based on this, the injection molded part 120 may include a first part 122 and a second part 123, with the first part 122 and the second part 123 connected. The first part 122 is located in the inner cavity 111 and forms the ignition chamber 112. The second part 123 is connected to the second housing 115. The ignition end 131 extends through the first part 122 into the ignition chamber 112, and the pin end 132 extends through the second part 123 into the second housing 115.

[0049] It should be noted that, as Figure 6 As shown, when configuring the aforementioned first part 122 and second part 123, the first part 122 and second part 123 can be molded together, or the first part 122 and second part 123 can be molded separately first, and then connected together during assembly.

[0050] Please refer to Figures 1-6 Based on the above structure, to improve the connection stability between the injection molded part 120 and the second housing 115, the second housing 115 includes a recess 116 that tapers inward toward the inner cavity 111, and a passage 117 is provided at the bottom of the recess 116; the second portion 123 is accommodated within the recess 116, and a portion of the second portion 123 passes through the passage 117 and connects with the first portion 122. Thus, with this arrangement, the injection molded part 120 can be stably connected to the second housing 115.

[0051] Furthermore, to increase the contact area between the injection molded part 120 and the second housing 115 and improve their connection stability, the diameter of the groove 116 gradually increases from its opening to its bottom. This creates a variable-diameter structure for the groove 116, with the opening gradually increasing in size from its opening to its bottom, resulting in a smaller opening profile than the bottom profile. This effectively improves the connection stability between the second part 123 and the second housing 115, preventing it from detaching from the second housing 115, at least during the injection molding of the second portion 123.

[0052] Based on the above structure, since the second portion 123 is injection molded integrally with the first portion 122 through the aforementioned through-hole 117, after the injection molded part 120 is formed, its first portion 122 and second portion 123 are located on the inner and outer sides of the bottom of the groove 116, respectively. Therefore, to improve the contact stability between the first portion 122 and the second portion 123 and the bottom of the groove 116, a first limiting groove 118 that mates with the first portion 122 is provided on the outer side of the bottom of the groove 116, and a second limiting groove 119 that mates with the second portion 123 is provided on the inner side of the bottom of the groove 116. With this arrangement, when the first portion 122 and the second portion 123 are injection molded, the portions that mate with the aforementioned first limiting groove 118 and second limiting groove 119 can be formed, thereby improving the stability of the injection molded part 120.

[0053] Please refer to Figures 1-6 In this embodiment, to improve the sealing of the ignition chamber 112 separated in the inner cavity 111, and to connect the gas generation chamber 113 and the ignition chamber 112 through the ignition hole 121 on the injection molded part 120, the first portion 122 is open at one end away from the second portion 123, and a cover 170 is installed at its open end. It should be noted that the cover 170 has various structural styles. When configuring the cover 170, it can be detachably connected to the first portion 122 and partially extend into the inner wall of the ignition chamber 112 to improve its sealing, or it can be placed on top of the ignition chamber 112. That is, the cover 170 can be embedded or wrapped around the ignition chamber 112 to seal it. Furthermore, when the cover 170 is made of resin material, it can be thermoplastically connected to the side wall of the ignition chamber 112. In addition to the two methods described above, it can also be integrally injection molded with the injection molded part 120.

[0054] Furthermore, in order for the ignition assembly 130 to operate, and for the gas generated by the introduction of the propellant 150 and the gas generating agent 160 in the gas generating chamber 113 to be able to discharge, the filter element 140 is spaced apart from the inner wall of the inner cavity 111, and the first housing 114 is provided with multiple exhaust holes on the portion opposite to the filter element 140. This allows the gas generated by the gas generating agent 160 to be discharged through the exhaust holes after being filtered by the filter element 140. Moreover, a foil 180 is provided at the interval between the filter element 140 and the inner wall of the inner cavity 111 to block the exhaust holes. In this way, the exhaust holes are closed when the gas generating agent is not generating gas, and when gas is generated in the gas generating chamber 113, the internal pressure increases, allowing the foil 180 to be broken through and the gas to be discharged from the exhaust holes.

[0055] Based on the above structure, a plug 190 connected to the filter element 140 is provided in the inner cavity 111. The plug 190 is used to seal the end of the filter element 140 facing the first housing 114, thereby improving the sealing of the gas generation chamber 113, so that the gas generated in the gas generation chamber 113 needs to be filtered by the filter element 140 and then discharged through the exhaust hole.

[0056] Based on the above structural settings, please refer to Figures 1-6 The preparation process of the gas generator 100 is as follows:

[0057] The ignition assembly 130 is installed on the second housing 115, with its ignition end 131 extending to the inside of the second housing 115 and its pin end 132 located outside the second housing 115.

[0058] Injection molding of part 120, forming ignition chamber 112;

[0059] Fill the ignition chamber 112 with ignition powder;

[0060] Install the cap 170, install the filter element 140, install the foil 180;

[0061] Fill the gas-generating chamber 113 with a gas-generating agent and install a plug 190;

[0062] The first housing 114 and the second housing 115 are then connected together. Moreover, in this embodiment, when connecting the first housing 114 and the second housing 115, a flange connection structure is configured on the first housing 114 or the second housing 115, and then the first housing 114 and the second housing 115 are assembled together through the flange connection. It should be noted that the connection between the first housing 114 and the second housing 115 can also be achieved by welding or other methods.

[0063] As can be seen from the above assembly process, during the installation process, it can simplify the internal connection process, and when installing the ignition component 130, it can reduce the required welding steps by using its injection molding part 120, and improve its overall sealing performance and structural stability.

[0064] 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 main body, an injection molded part, an ignition assembly, and a filter element; The main body is configured with an inner cavity, the injection molded part is connected to the main body and at least partially extends into the inner cavity, dividing the inner cavity into an ignition chamber and a gas generation chamber; the ignition chamber is used to fill the ignition propellant, and the gas generation chamber is used to fill the gas generator; The injection molded part has an ignition hole in the portion located in the inner cavity that connects the ignition chamber and the gas generation chamber. The ignition assembly is placed inside the injection molded part, and the ignition end of the ignition assembly extends into the ignition chamber, while the pin end of the ignition assembly extends through the injection molded part to the outside of the main body.

2. The gas generator according to claim 1, characterized in that: The main body includes a first housing and a second housing connected to the first housing, the first housing and the second housing together forming the inner cavity; The injection molded part is connected to the second housing, and the pin end of the ignition assembly extends out from the second housing.

3. The gas generator according to claim 2, characterized in that: The injection molded part includes a first portion and a second portion, the first portion being connected to the second portion; the first portion is located in the inner cavity and forms the ignition chamber; the second portion is connected to the second housing. The ignition end extends through the first portion into the ignition chamber, and the pin end extends through the second portion into the second housing.

4. The gas generator according to claim 3, characterized in that: The second housing includes a recess that tapers inward toward the inner cavity, and a passage is provided at the bottom of the recess; The second portion is housed within the groove, and a portion of the second portion passes through the through-hole and connects to the first portion.

5. The gas generator according to claim 4, characterized in that: The diameter of the groove gradually increases from its opening to its bottom.

6. The gas generator according to claim 4, characterized in that: The groove has a first limiting groove on the outer side of its bottom that cooperates with the first portion, and a second limiting groove on the inner side of its bottom that cooperates with the second portion.

7. The gas generator according to claim 3, characterized in that: The first portion is open at the end opposite to the second portion, and a cap is installed at the open end.

8. The gas generator according to claim 2, characterized in that: The filter element is spaced apart from the inner wall of the inner cavity, and the first housing has multiple exhaust holes in the portion opposite to the filter element.

9. The gas generator according to claim 8, characterized in that: A foil sheet is provided at the interval between the filter element and the inner wall of the inner cavity to block the exhaust hole.

10. The gas generator according to claim 2, characterized in that: The inner cavity is provided with a plug connected to the filter element, and the plug is used to seal the end of the filter element facing the first housing.

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