A segmented delay triggered gas generator

Abstract

The utility model discloses a subsection time delay trigger's gas generator device. It includes: the lateral wall of casing is equipped with the air hole no. 1, the inside of casing is equipped with first chamber and second chamber, first chamber is located below second chamber, and one or several through -holes are equipped between first chamber and second chamber, and igniter is located in first chamber, and first gas -generating medicine is placed in first chamber, and second gas -generating medicine is placed in second chamber, and first chamber is open -type chamber and is communicated with the air hole no. 1, and second chamber is closed -type chamber and is equipped with the air hole on the lateral wall of second chamber, and first chamber gas -generating precedes second chamber, and the first gas of first chamber produces is preferentially entered into the air bag through the air hole no. 1, and second chamber is ignited by first chamber and produces second gas, and second gas enters the air bag again through the air hole and the air hole no. 1. The utility model has the beneficial effect that: satisfy the impact of air bag early opening to instrument panel and windshield is small, and the passenger excellent protection performance of air bag fast opening in the middle period.

Description

Technical Field

[0001] This utility model relates to the technical field of gas generators, and in particular to a segmented time-delay triggered gas generator. Background Technology

[0002] The automotive gas generator is a core component of the airbag system. It is primarily used to rapidly generate inert gas (such as nitrogen) during a vehicle collision, causing the airbag to inflate and deploy within milliseconds to protect occupants. Its working principle is divided into two types: pyrotechnic (producing gas through the combustion of chemical agents) and hybrid (combining compressed gas with a chemical reaction). Modern vehicles often employ a two-stage design, making it a crucial component in the field of automotive passive safety.

[0003] Currently, most bipolar gas generators use two igniters to ignite the gas-generating agent in two chambers in stages to achieve a secondary gas filling effect, which is complex in structure and expensive.

[0004] In summary, there is a need for a segmented delay-triggered gas generator that is simple in structure and low in cost. Utility Model Content

[0005] This invention aims to overcome the shortcomings of existing bipolar gas generators, which often use two igniters to ignite the gas-generating agent in two chambers in stages to achieve secondary gas filling, resulting in complex structures and high costs. It provides a segmented delay-triggered gas generator with a simple structure and low cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A segmented time-delay triggered gas generator device is used to inflate a gas bag. The gas generator device includes components such as a housing, an igniter, a propellant cup, a ignition propellant, a first gas-generating propellant, and a second gas-generating propellant. The housing has a vent hole on its side wall. The housing has a first cavity and a second cavity inside. The first cavity is located below the second cavity. One or more through holes are provided between the first cavity and the second cavity. The igniter is located in the first cavity. The first gas-generating propellant is placed in the first cavity, and the second gas-generating propellant is placed in the second cavity. The first cavity is an open cavity and communicates with the vent hole. The second cavity is a closed cavity. A vent hole is also provided on the side wall of the second cavity. The first cavity produces gas before the second cavity. The first gas produced by the first cavity enters the gas bag preferentially through the vent hole. The second gas is ignited by the first cavity and produces a second gas. The second gas then enters the gas bag through the vent hole and the vent hole.

[0007] This application utilizes the heat from the first gas-generating propellant to delay the ignition of the second gas-generating propellant, resulting in a simple structure and low cost. Furthermore, the output pressure performance of this structure exhibits a gradual initial pressure increase followed by a rapid rise in pressure during the later stages of delayed ignition of the second gas-generating propellant. This ensures minimal impact on the dashboard and windshield during the initial airbag deployment and provides excellent passenger protection through rapid airbag deployment in the middle stages.

[0008] Preferably, a first sealing sheet may be provided at the vent, which ruptures when it reaches a certain pressure threshold to prevent the second gas from entering the air bag.

[0009] Preferably, a second sealing sheet may be provided at the through hole. When the second sealing sheet reaches a certain pressure threshold, it will break, thereby delaying the ignition time of the first chamber to the second chamber and further delaying the gas production time of the second chamber.

[0010] Preferably, the thickness of both the first and second sealing sheets is 0.05mm to 0.5mm, the material of both the first and second sealing sheets is stainless steel or aluminum, and the rupture threshold of both the first and second sealing sheets is 3 to 50 MPa. This application can control the delay time of secondary inflation by controlling the strength and thickness of the diaphragm, thus achieving the purpose of segmented inflation.

[0011] Preferably, the staged inflation delay range of the first gas and the second gas is 1ms to 30ms.

[0012] Preferably, the ignition propellant is placed inside the propellant cup, which has a second vent hole. The propellant cup may be located only inside the first cavity, or it may extend through both the first and second cavities, but the second vent hole is always located inside the first cavity. This application uses an igniter to ignite the ignition propellant in the propellant cup, and the heat and spark generated by the ignition propellant ignite the first gas-generating propellant to produce the first gas.

[0013] Preferably, the volume ratio of the first chamber to the second chamber is adjustable between 1:2 and 2:1. This achieves a dynamic balance between gas production efficiency, pressure control, safety, and adaptability.

[0014] Preferably, a filter screen is provided between the inner wall of the housing and the first and second cavities. The filter screen extends from the bottom to the top of the housing, and a ventilation space is provided around the first air outlet. This filter screen design effectively intercepts and filters debris and impurities generated during the chemical reaction process, preventing them from entering the airbag with the airflow.

[0015] Preferably, the inner diameter of the filter screen is smaller than the outer diameter of the second cavity, and the volume ratio of the first cavity to the second cavity is set and adjusted by the interference assembly of the second cavity with the filter screen.

[0016] A segmented delayed-trigger gas generator device includes: a housing, an igniter, a propellant cup, a ignition propellant, a first gas-generating propellant, a second gas-generating propellant, a filter screen, and other components. The housing has a vent hole on its side wall. The housing contains a first chamber and a second chamber, with the first chamber located below the second chamber. A vent hole is provided on the side wall of the second chamber. The igniter is located within the first chamber. The gas generator device's gas output path after ignition is as follows: the first chamber is first ignited to generate a first gas. This first gas is filtered through the filter screen and flows through the vent hole into the airbag. Simultaneously, the first gas melts a second sealing plate and enters the second chamber through a through-hole. The second chamber is ignited to generate a second gas. This second gas melts the first sealing plate and flows through the vent hole and filter screen into the airbag through the vent hole. Furthermore, this structure exhibits a gradual initial pressure rise followed by a rapid increase in pressure in the later stages after the delayed ignition of the secondary gas-generating propellant. This design ensures minimal impact on the dashboard and windshield during the initial airbag deployment and provides excellent passenger protection through rapid deployment in the middle stages.

[0017] The advantages of this invention are: simple structure and low cost; minimal impact on the dashboard and windshield during the initial deployment of the airbag, and excellent protection for passengers during rapid deployment in the middle stage; and effective interception and filtration of debris and impurities generated during the chemical reaction process, preventing them from entering the airbag with the airflow. Attached Figure Description

[0018] Figure 1 , Figure 2 and Figure 3 This is a schematic diagram of the structure of the first embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model; Figure 5 This is a structural schematic diagram of the third embodiment of the present invention.

[0019] In the diagram: 1. Shell, 2. Vent 1, 3. First gas-generating agent, 4. Ignition device, 5. Propellant cup, 6. Flame-transmitting agent, 7. Second chamber, 8. Vent hole, 9. Second gas-generating agent, 10. First sealing plate, 11. Filter screen, 12. Chamber cover, 13. Vent 2, 14. First chamber, 15. Through hole, 16. Second sealing plate, 17. Ventilation space. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-3In the described embodiment, a segmented delay-triggered gas generator device is used to inflate a gas bag. The gas generator device includes components such as a housing 1, an igniter 4, a powder cup 5, a ignition charge 6, a first gas-generating charge 3, and a second gas-generating charge 9. The housing 1 has a gas outlet 2 on its side wall. The housing 1 has a first cavity 14 and a second cavity 7 inside, with the first cavity 14 located below the second cavity 7. One or more through holes 15 are provided between the first cavity 14 and the second cavity 7. The igniter 4 is located inside the first cavity 14. The first gas-generating agent 3 is placed in the first cavity 14, and the second gas-generating agent 9 is placed in the second cavity 7. The first cavity 14 is an open cavity and is connected to the gas outlet 2. The second cavity 7 is a closed cavity. A vent hole 8 is also provided on the side wall of the second cavity 7. The first cavity 14 generates gas before the second cavity 7. The first gas generated by the first cavity 14 enters the gas bag preferentially through the gas outlet 2. The second cavity 7 is ignited by the first cavity 14 to generate the second gas. The second gas enters the gas bag again through the vent hole 8 and the gas outlet 2.

[0022] A first sealing plate 10 can be provided at the vent 8. When the first sealing plate 10 reaches a certain pressure threshold, it will break to prevent the second gas from entering the air bag.

[0023] A second sealing plate 16 may be provided at the through hole 15. When the second sealing plate 16 reaches a certain pressure threshold, it will break, which is used to delay the ignition time of the first chamber 14 to the second chamber 7, and further delay the gas production time of the second chamber 7.

[0024] The thickness of the first sealing sheet 10 and the thickness of the second sealing sheet 16 are both 0.05mm to 0.5mm. The materials of the first sealing sheet 10 and the second sealing sheet 16 are both stainless steel or aluminum. The rupture threshold of the first sealing sheet 10 and the rupture threshold of the second sealing sheet 16 are both 3 to 50 MPa.

[0025] The staged inflation delay range for the first and second gases is 1ms to 30ms.

[0026] The ignition powder 6 is placed inside the powder cup 5. The powder cup 5 is provided with a second vent hole 13. The powder cup 5 may be located only inside the first cavity 14, or it may pass through the first cavity 14 and the second cavity 7, but the second vent hole 13 is always located inside the first cavity 14.

[0027] The volume ratio of the first cavity 14 to the second cavity 7 is adjustable between 1:2 and 2:1.

[0028] A filter screen 11 is provided between the inner wall of the housing 1 and the first cavity 14 and the second cavity 7. The filter screen 11 extends from the bottom to the top of the housing 1, and a ventilation space 17 is provided around the air outlet 2.

[0029] The inner diameter of the filter screen 11 is smaller than the outer diameter of the second cavity 7. The second cavity 7 is assembled with the filter screen 11 through interference to set and adjust the volume ratio between the first cavity 14 and the second cavity 7.

[0030] A segmented time-delay triggered gas generator device includes: a housing 1, an igniter 4, a powder cup 5, a ignition powder 6, a first gas-generating powder 3, a second gas-generating powder 9, a filter screen 11, and other components. The housing 1 has a vent hole 2 on its side wall. The housing 1 has a first cavity 14 and a second cavity 7 inside. The first cavity 14 is located below the second cavity 7. The second cavity 7 has a vent hole 8 on its side wall. The igniter 4 is located inside the first cavity 14. The gas generator device has the following gas output path after ignition: the first cavity 14 is first ignited to generate a first gas. The first gas is filtered by the filter screen 11 and flows into the gas bag through the vent hole 2. Then / or simultaneously, the first gas melts the second sealing plate 16 and enters the second cavity 7 through the through hole 15. The second cavity 7 is ignited to generate a second gas. The second gas melts the first sealing plate 10 and flows into the gas bag through the vent hole 8 and the filter screen 11, and then flows into the gas bag through the vent hole 2.

[0031] like Figure 4 As shown in the embodiment, the medicine cup 5 is located inside the first cavity 14.

[0032] like Figures 1-4 As shown in the embodiments, the gas generator device can be in the shape of a disc.

[0033] like Figure 5 As shown in the embodiments, the gas generator device can also be cylindrical in shape.

[0034] In use, this application ignites the ignition charge 6 in the ignition cup 5 using the igniter 4. The heat and spark generated by the ignition charge 6 then enter the housing 1 through the second vent 13 to ignite the first gas-generating charge 3, producing the first gas. The first gas is filtered by the filter screen 11 and flows into the gas bag through the first vent 2 (since the first chamber 14 produces gas before the second chamber 7, the first gas produced by the first chamber 14 will preferentially enter the gas bag through the first vent 2). When the pressure inside the housing 1 rises to a certain value, it will push against the first sealing plate 10 at the vent 8. The heat and spark of the first gas then enter the second chamber 7 through the vent 8 to ignite the second gas-generating charge 9, producing the second gas. The second gas enters the gas bag through the vent 8, the filter screen 11, and the first vent 2, thereby achieving the purpose of using the heat of the first gas-generating charge 3 to delay the ignition of the second gas-generating charge 9. The gas produced by the first gas-generating charge 3 and the second gas-generating charge 9 is filtered by the filter screen 11 and fills the gas bag through the first vent 2. Furthermore, the output pressure performance of this structure product features a gradual increase in pressure in the early stage, followed by a rapid increase in pressure in the middle and later stages after the delayed ignition of the second propellant 9. This ensures that the airbag has minimal impact on the dashboard and windshield during the initial deployment and provides excellent protection for passengers during the rapid deployment in the middle stage.

Claims

1. A segmented time-delay triggered gas generator for inflating a gas bag, the gas generator comprising: The housing (1), igniter (4), powder cup (5), ignition charge (6), first gas-generating charge (3), and second gas-generating charge (9) are provided. A vent hole (2) is provided on the side wall of the housing (1). The housing (1) contains a first cavity (14) and a second cavity (7). The first cavity (14) is located below the second cavity (7). One or more through holes (15) are provided between the first cavity (14) and the second cavity (7). The igniter (4) is located in the first cavity (14). The first gas-generating charge (3) is placed in the first cavity (14), and the second gas-generating charge (9) is placed in the second cavity (6). The first cavity (14) is an open cavity and is connected to the first air outlet (2). The second cavity (7) is a closed cavity. A ventilation hole (8) is provided on the side wall of the second cavity (7). The first cavity (14) produces gas before the second cavity (7). The first gas produced by the first cavity (14) enters the air bag preferentially through the first air outlet (2). The second cavity (7) is ignited by the first cavity (14) to produce a second gas. The second gas enters the air bag again through the ventilation hole (8) and the first air outlet (2).

2. The segmented delay-triggered gas generator according to claim 1, characterized in that, A first sealing plate (10) may be provided at the vent (8). When the first sealing plate (10) reaches a certain pressure threshold, it will break to block the second gas from entering the air bag.

3. A segmented time-delay triggered gas generator according to claim 2, characterized in that, A second sealing plate (16) may be provided at the through hole (15). When the second sealing plate (16) reaches a certain pressure threshold, it will break to delay the ignition time of the first chamber (14) to the second chamber (7) and further delay the gas production time of the second chamber (7).

4. A segmented time-delay triggered gas generator according to claim 2 or 3, characterized in that, The thickness of the first sealing sheet (10) and the thickness of the second sealing sheet (16) are both 0.05mm to 0.5mm. The materials of the first sealing sheet (10) and the second sealing sheet (16) are both stainless steel or aluminum. The rupture threshold of the first sealing sheet (10) and the rupture threshold of the second sealing sheet (16) are both 3 to 50 MPa.

5. A segmented time-delay triggered gas generator according to claim 1, characterized in that, The staged inflation delay range for the first gas and the second gas is 1ms to 30ms.

6. A segmented delay-triggered gas generator according to claim 1, characterized in that, The ignition propellant (6) is placed inside the ignition cup (5). The ignition cup (5) is provided with a second vent hole (13). The ignition cup (5) may be located only inside the first cavity (14) or may extend through the first cavity (14) and the second cavity (7). However, the second vent hole (13) is always located inside the first cavity (14).

7. A segmented time-delay triggered gas generator according to claim 1, characterized in that, The volume ratio of the first cavity (14) to the second cavity (7) is adjustable between 1:2 and 2:

1.

8. A segmented time-delay triggered gas generator according to claim 1, characterized in that, A filter screen (11) is provided between the inner wall of the housing (1) and the first cavity (14) and the second cavity (7). The filter screen (11) extends from the bottom to the top of the housing (1). The filter screen (11) has a ventilation space (17) around the air outlet (2).

9. A segmented delay-triggered gas generator according to claim 8, characterized in that, The inner diameter of the filter screen (11) is smaller than the outer diameter of the second cavity (7). The second cavity (7) is configured and adjusted by interfering with the filter screen (11) to set and adjust the volume ratio of the first cavity (14) to the second cavity (7).

10. A segmented time-delay triggered gas generator, comprising: The housing (1), igniter (4), powder cup (5), ignition charge (6), first gas-generating charge (3), second gas-generating charge (9), and filter screen (11) are provided. A vent hole (2) is provided on the side wall of the housing (1). The housing (1) contains a first cavity (14) and a second cavity (7). The first cavity (14) is located below the second cavity (7). A vent hole (8) is provided on the side wall of the second cavity (7). The igniter (4) is located inside the first cavity (14). The housing (1) is characterized by the following features: The gas generator's outlet path after ignition is as follows: the first chamber (14) is ignited to generate the first gas. The first gas is filtered through the filter screen (11) and flows into the gas bag through the outlet hole (2). Then / or at the same time, the first gas melts the second sealing plate (16) and enters the second chamber (7) through the through hole (15). The second chamber (7) is ignited to generate the second gas. The second gas melts the first sealing plate (10) and flows into the gas bag through the vent hole (8) and the filter screen (11) through the outlet hole (2).

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