Special-shaped gas generating agent and gas generator

Abstract

The utility model relates to a special-shaped gas generating agent and a gas generator, the special-shaped gas generating agent comprises a base surface and a special-shaped part formed by movement of a semicircle on the base surface, and the straight line edge of the semicircle is located on the base surface. According to an existing gas generating agent, due to the fact that large mutually-parallel combustion faces exist in the later period of combustion, the combustion faces can be completely overlapped when combustion is used up, the combustion faces are suddenly reduced to zero, and combustion is suddenly stopped; through combustion surface pushing simulation calculation, in the whole combustion process of the gas generating agent with the appearance provided by the invention, non-parallel combustion surface pushing directions exist, the combustion surface does not suddenly change to zero, and stable ending of combustion can be ensured.

Description

Technical Field

[0001] The utility model relates to the field of gas generating agents for safety airbags, in particular to a special-shaped gas generating agent and a gas generator. Background Art

[0002] With the development of economy and the improvement of industrial level, automobile production capacity is increasing day by day, more and more cars are on the road, and more and more traffic accidents are coming. The intervention of airbags has effectively reduced the casualties of traffic accidents. Airbags can be said to be the greatest application since the birth of automobiles. In the development of the automobile industry, they have also undergone many iterations and updates. The core component of the airbag is the gas generator. When a car has an accident, the gas generator receives the detonation signal and will generate a large amount of gas in a very short time, causing the airbag to inflate and expand, which plays a buffering and lifting role for the car occupants, avoiding direct collision between the occupants and the hard parts of the car, thereby protecting the occupants.

[0003] At present, the most widely used gas generating agent in the world is the pyrotechnic compound gas generating agent, which generally uses guanidine nitrate and basic copper nitrate as the main raw materials, and adds a certain amount of additives to optimize the ignition performance of the gas generating agent.

[0004] This type of gas-generating agent is usually a cylindrical sheet or a cylinder with a hole in the middle. When the cylindrical sheet-shaped gas-generating agent is burning, the two end faces will advance parallel to the inside of the agent column, and finally meet when they are completely burned out. At this time, the burning surface suddenly changes to zero, and no gas is generated; similarly, when the inner and outer cylindrical surfaces of the cylindrical medium-hole agent are burned, they meet when they are completely burned out, and the burning surface also suddenly changes to zero, and no gas is generated. Therefore, when the gas generator using these two types of agents is working, after reaching the maximum pressure, the pressure will begin to decrease, which leads to a decrease in the later lifting capacity of the airbag, resulting in insufficient occupant protection capabilities of the airbag in accidents.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The utility model aims to provide a special-shaped gas generating agent and a gas generator, which can suppress the sudden drop in pressure of existing tablets or columnar medicines after reaching the maximum pressure, resulting in a decrease in the later lifting capacity of the airbag, causing the defect of insufficient occupant protection ability of the airbag in an accident.

[0007] The embodiment of the utility model is achieved as follows:

[0008] In a first aspect, the utility model provides a special-shaped gas generant, comprising a base surface and a special-shaped portion formed by a semicircle moving on the base surface, wherein the straight edge of the semicircle is located on the base surface.

[0009] In an optional embodiment, the special-shaped portion is obtained by moving a semicircle along a closed curve on a base surface.

[0010] In an optional embodiment, the special-shaped portion is obtained by moving a semicircle along a circular curve on a base surface.

[0011] In an optional embodiment, there are two special-shaped portions, which are symmetrically arranged along the base surface.

[0012] In an optional embodiment, the gas generating agent is in the form of a ring with an outer diameter of 3-10 mm and an inner diameter of 1-8 mm.

[0013] In an optional embodiment, the special-shaped portion is obtained by the semicircle rotating along the axis of symmetry of the semicircle.

[0014] In an optional embodiment, a cylindrical portion is further included, and the base surface is located on the end surface of the cylindrical portion.

[0015] In an optional embodiment, there are two base surfaces, which are respectively located on two end surfaces of the cylindrical portion, and each base surface is correspondingly provided with a special-shaped portion.

[0016] In an optional embodiment, the gas generating agent includes a cylindrical portion and hemispherical bodies located at both ends of the cylindrical portion, the cylindrical portion has a diameter of 3-12 mm and a height of 3-8 mm, and the diameter of the hemispherical body is the same as that of the cylinder.

[0017] A second aspect of the present application provides a gas generator, comprising any one of the aforementioned special-shaped gas generating agents.

[0018] The beneficial effects of the embodiments of the utility model are:

[0019] The existing gas generators have parallel combustion surfaces, which will completely overlap when burned out, causing the combustion surface to suddenly drop to zero and the combustion to stop suddenly. The gas generator with the shape provided in the present application has a non-parallel combustion surface propulsion direction throughout the combustion process, and the combustion surface will not suddenly change to zero, which can ensure the smooth end of combustion.

[0020] After the gas generator using the gas generator of the present application starts working, it can maintain combustion for a period of time and output gas after reaching the maximum pressure. However, after the gas generator using the conventional gas generator reaches the maximum pressure, the combustion will suddenly stop and no longer produce gas. Therefore, the present application can improve the combustion performance of the gas generator, making it more suitable for automobile airbags, and can effectively improve the lifting capacity of the airbag in the later stage of operation, thereby improving the protection ability of the cabin occupants. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, 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 utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the gas generating agent in Example 1 of the utility model;

[0023] Figure 2 The combustion surface transition curve of the gas generating agent in Example 1 of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the gas generating agent in Example 2 of the utility model;

[0025] Figure 4 The combustion surface transition curve of the gas generating agent in Example 2 of the utility model;

[0026] Figure 5 It is a schematic diagram of the structure of the gas generating agent in Comparative Example 1 of the present utility model;

[0027] Figure 6 The combustion surface transition curves of the gas generating agent in Example 1 of the utility model and Comparative Example 1 are compared;

[0028] Figure 7 It is a comparison diagram of PT curves of the generators equipped with the gas generating agents in Example 1 of the utility model and Comparative Example 1;

[0029] Figure 8 This is a schematic diagram of the structure of the gas generating agent in Comparative Example 2 of the present utility model;

[0030] Fig. 9 The combustion surface transition curves of the gas generating agent in Example 2 of the utility model and Comparative Example 2 are compared;

[0031] Fig.10 It is a comparison chart of the PT curves of the generators equipped with the gas generating agents in Example 2 of the utility model and Comparative Example 2.

[0032] Icon: 1- torus; 2- cylindrical part; 3- hemisphere. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] 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 present invention to be protected, 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.

[0035] 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.

[0036] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Please refer to Figure 1 This embodiment provides a special-shaped gas generating agent, including a base surface and a special-shaped portion formed by a semicircle moving on the base surface, wherein the straight edge of the semicircle is located on the base surface.

[0040] The gas generator in the present application includes a base surface, and the base surface here can be a virtual plane for holding the special-shaped part. The special-shaped part in this embodiment is different according to the different semicircular motion trajectories, but in order to keep the surface of the special-shaped gas generator in this embodiment smooth, the straight edge of the semicircle needs to be kept on the base surface during the movement.

[0041] The existing gas generators have parallel combustion surfaces, which will completely overlap when burned out, causing the combustion surface to suddenly drop to zero and the combustion to stop suddenly. The gas generator with the shape provided in the present application has a non-parallel combustion surface propulsion direction throughout the combustion process, and the combustion surface will not suddenly change to zero, which can ensure the smooth end of combustion.

[0042] After the gas generator using the gas generator of the present application starts working, it can maintain combustion for a period of time and output gas after reaching the maximum pressure. However, after the gas generator using the conventional gas generator reaches the maximum pressure, the combustion will suddenly stop and no longer produce gas. Therefore, the present application can improve the combustion performance of the gas generator, making it more suitable for automobile airbags, and can effectively improve the lifting capacity of the airbag in the later stage of operation, thereby improving the protection ability of the cabin occupants.

[0043] In some embodiments of the present application, the special-shaped portion is obtained by moving a semicircle along a closed curve on a base surface, which can ensure that all parts of the special-shaped portion except the plane where the base surface is located are curved surfaces.

[0044] In some embodiments of the present application, the special-shaped portion is obtained by moving a semicircle along a circular curve on a base surface to obtain a semi-torus-shaped special-shaped portion.

[0045] In some embodiments of the present application, there are two special-shaped parts, which are symmetrically arranged along the base surface to obtain a toroidal 1-shaped gas generant, and the surface of the toroidal 1-shaped gas generant is a smooth curved surface without edges and corners.

[0046] In some embodiments of the present application, the gas generating agent is a ring surface 1 with an outer diameter of 3-10 mm and an inner diameter of 1-8 mm.

[0047] Since the size of the gas generator is closely related to the combustion surface, if the size of the gas generator is too large, the combustion surface is too small, and the slope of the external pressure curve is too small; if the size of the gas generator is too effective, the combustion surface is too large, the combustion speed is too fast, the slope of the external pressure curve is too large, and more gas is produced, so that the airbag is deployed too quickly and cannot effectively protect the passengers. Therefore, it is necessary to adjust the size adaptively according to the structure of the gas generator to make the combustion surface and the combustion speed moderate.

[0048] In some embodiments of the present application, the special-shaped portion is obtained by rotating the semicircle along the axis of symmetry of the semicircle, and a hemispherical special-shaped portion can be obtained.

[0049] In some embodiments of the present application, a cylindrical portion 2 is further included, and the base surface is located on the end surface of the cylindrical portion 2 .

[0050] Specifically, the cylindrical portion 2 in this embodiment can be a cylinder, and the special-shaped portion can be a hemispherical shape located at the two end faces of the cylinder; in some embodiments, the cylindrical portion 2 can also be a structure with a through hole in the middle. In this case, the special-shaped portion can be a semi-annular surface located at both ends of the cylindrical portion 2, with a through hole in the middle, and can also increase the combustion surface to a certain extent.

[0051] In some embodiments of the present application, there are two base surfaces, which are respectively located on the two end surfaces of the cylindrical portion 2, and each base surface is correspondingly provided with a special-shaped portion.

[0052] In some embodiments of the present application, the gas generating agent includes a cylindrical portion 2 and hemispherical bodies 3 located at both ends of the cylindrical portion 2, the cylindrical portion 2 has a diameter of 3-12 mm and a height of 3-8 mm, and the diameter of the hemispherical body 3 is the same as that of the cylinder.

[0053] The density of the gas generating agent in this application is in the range of 1.8-2.4 g / cm 3 When burning in a 60-liter tank, the maximum pressure of the gas generated by the combustion of the gas generating agent is between 65-95KPa.

[0054] The present application may also provide a gas generator, comprising any of the aforementioned special-shaped gas generating agents.

[0055] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0056] Example 1

[0057] This embodiment provides a heterogeneous gas generating agent, the shape of which is as follows Figure 1 The gas generating agent is a ring surface 1, with a smooth surface and no edges and corners. The specific dimensions are: the outer circle diameter is 8mm, and the inner circle diameter is 2mm. The combustion surface displacement curve is as follows Figure 2 shown.

[0058] Example 2

[0059] In this embodiment, the gas generating agent is a spherical cylinder with a shape as shown in FIG. Figure 3 As shown, it is similar to a capsule, with a middle section of a cylinder with a height of 5 mm and a diameter of 4 mm, and two ends of a hemisphere with a diameter of 4 mm. The combustion surface displacement curve is shown in Figure 4 shown.

[0060] Comparative Example 1

[0061] One of the two widely used drug forms, the circular Figure 5 As shown, the specific dimensions are: outer ring diameter is 8mm, inner ring diameter is 2mm, and height is 3mm.

[0062] The combustion surface transition curves of the two medicine types in Example 1 and Comparative Example 1 are as follows: Figure 6 As shown: It can be seen from the figure that there is a great difference in the process of the combustion surface displacement in the later stage of combustion. In Example 1, the speed uniformly decreases to 0 in the later stage, while in Comparative Example 1 it suddenly becomes 0. It can be inferred that under similar size conditions, the combustion of the medicine provided in Example 1 is more stable and lasting.

[0063] The gas generating agent of the Chinese medicine type in Example 1 and Comparative Example 1 was used to assemble the PAB generator to carry out the TANK external pressure test experiment. The PT curve is as follows: Figure 7 As shown in Table 1, the two generators maintain 95% of the maximum pressure (95%P MAX ) above. It can be seen that the generator using the drug form of Example 1 maintains 95% P MAX The time is longer and the inflation capacity in the latter part is significantly better.

[0064] Table 1 Generators assembled in Example 1 and Comparative Example 1 maintain 95% P MAX time

[0065] Drug Form <![CDATA[Time (ms) to maintain 95% P MAX > Example 1 (ring body) 55 Comparative Example 1 (ring shape) 39

[0066] Comparative Example 2

[0067] One of the two widely used drug forms, a round tablet Figure 8 As shown, the specific dimensions are: diameter 6.4mm, thickness 3mm.

[0068] The combustion surface transition curves of the two medicine types of Example 2 and Comparative Example 2 are as follows: Fig. 9 As shown: Fig. 9 It can be seen that there is a great difference in the process of the combustion surface displacement in the later stage of combustion. In Example 2, the speed decreases uniformly to 0 in the later stage, while in Comparative Example 2, it suddenly becomes 0. It can be inferred that under similar size conditions, the combustion of the medicine type in Example 2 is more stable and lasting.

[0069] The gas generating agents of Example 2 and Comparative Example 2 were used to assemble the PAB generator to carry out the TANK external pressure test experiment. The PT curves are shown in Fig.10 As shown in Table 2, the two generators maintain 95% of the maximum pressure (95%P MAX ) above. It can be seen that the generator using the pharmaceutical form of Example 2 maintains 95% P MAX The time is longer and the inflation capacity in the latter part is significantly better.

[0070] Table 2 Generators assembled in Example 2 and Comparative Example 2 maintain 95% P MAX time

[0071]

[0072] The present application proposes to innovate the shape of the gas generator through simulation calculation of the combustion surface movement, including but not limited to the torus 1, the spherical end cylinder, etc. During the whole combustion process, the gas generator with the shape provided by the present application has a non-parallel combustion surface advancement direction, and the combustion surface will not suddenly change to zero, which can ensure the smooth end of combustion.

[0073] The present application can improve the combustion performance of the gas generating agent, making it more suitable for automobile airbags, and can effectively improve the lifting capacity of the airbag in the later stage of operation, thereby improving the protection capability of the cabin occupants.

[0074] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A special-shaped gas generating agent, characterized in that: The gas generating agent is in a toroidal shape.

2. The irregularly shaped gas generating agent according to claim 1, characterized in that: The gas generating agent has an outer diameter of 3-10 mm and an inner diameter of 1-8 mm.

3. A gas generator, characterized in that: Including the special-shaped gas generating agent as described in claim 1 or 2.

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