Device and method for vehicle safety air bag based on air cylinder triggering

Abstract

The invention discloses a vehicle safety air bag device based on air cylinder triggering, and aims to provide the vehicle safety air bag device based on air cylinder triggering, which can improve the placement and triggering stability and improve the use safety. The device comprises a diffusion shell, a generating housing; an exhaust housing; the gas guide filter plate is integrally connected with the generation shell, the gas guide filter plate is provided with guide filter holes, the generation column body is provided with generation gas outlet holes, the gas inlet is formed in one side of the guide filter holes, and the generation gas outlet holes are formed in the other side of the guide filter holes; the piston body is elastically connected with the diffusion shell, one end of the piston body is arranged in the buffer diffusion chamber and is in opening and closing connection with the air inlet, and the other end of the piston body is arranged in the exhaust chamber and is in opening and closing connection with the air outlet. The gas generating device has the beneficial effects that the gas generating device is stable in structural connection and assembly and easy to place; the use safety of the airbag is improved; environmental influence factors are reduced to improve the triggering stability; and green and energy-saving benefits are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle airbag, and particularly relates to a device and method for vehicle airbag based on cylinder triggering. BACKGROUND

[0002] In order to protect the safety of the people in the vehicle as much as possible in the event of an accident, a safety airbag is arranged in the vehicle, and the safety airbag is inflated by a connected gas generator to buffer the impact force.

[0003] A gas generator for an airbag is disclosed in Chinese Patent No. CN114604196B, which was authorized on February 9, 2024. The technical solution of the gas generator comprises an ignition tube, a shell and a flow guide cover, the ignition tube and the flow guide cover are located at two ends of the shell, a booster support assembly is fixed in the shell, the booster support assembly is located at the upper end of the ignition tube, the booster support assembly is provided with an annular space for placing booster powder, the center of the booster support assembly is an open center opening, the center opening hole faces the flow guide cover, and the center of the booster support assembly is an open center opening, which makes the center of the booster support seat open and does not hinder the pressure wave. The technical solution has the following disadvantages: the smoke fire type gas generator is used, the explosion reaction is irreversible, there is a risk of accidental triggering, and the environmental protection problem exists in the scrap processing; the gas temperature is extremely high, which may cause secondary injury; the composition of the gunpowder is affected by the environment temperature and humidity.

[0004] In summary, the existing gas generating device in the airbag has the disadvantages of low stability, easy failure caused by environmental influence and easy secondary injury. SUMMARY

[0005] The present application is to overcome the disadvantages of low stability, easy failure caused by environmental influence and easy secondary injury of the existing gas generating device in the airbag, and provides a device for vehicle airbag based on cylinder triggering, which improves the stability of placement and triggering and improves the safety in use.

[0006] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application: A device for vehicle airbag based on cylinder triggering, comprising A diffusion shell, an inner cavity of the diffusion shell is arranged as a buffer diffusion chamber, one end of the diffusion shell is provided with an air inlet, and the other end of the diffusion shell is provided with an air outlet; A generating shell, the generating shell is detachably connected with one end of the diffusion shell, a generating column is connected in the generating shell, a plurality of catalyst chambers and gas generating chambers are arranged in the inner cavity of the generating column, a diaphragm is arranged between the catalyst chambers and the gas generating chambers, and the diaphragm is connected with the gas generating chamber; The exhaust shell is integrally connected with the other end of the diffusion shell, and is provided with an exhaust chamber connected with the gas outlet, and a plurality of exhaust holes. The gas guide filter plate is integrally connected with the generating shell, and is provided with guide filter holes. The piston body is elastically connected with the diffusion shell, and one end of the piston body is connected with the gas inlet in the buffer diffusion chamber, and the other end of the piston body is connected with the gas outlet in the exhaust chamber.

[0007] The generating shell is used for catalytic reaction of gas, the diffusion shell is used for transition and pressure regulation of a large amount of gas generated by catalytic reaction, and the exhaust shell is used for exhausting gas to inflate the air bag. The generating shell is connected with the diffusion shell with the gas inlet in a detachable manner, and the generating column is fixed in the generating shell to facilitate assembly of components; the catalyst chamber is filled with catalyst, and the gas generating chamber is filled with reaction gas; a large amount of gas is generated after the catalyst is carried by high-pressure gas and breaks through the diaphragm; the catalyst chamber and the gas generating chamber are provided with a plurality of chambers to optimize the gas generation efficiency and improve the safety; the mixing of gas and catalyst is triggered by high-pressure gas by impact instead of ignition of gunpowder, so as to avoid the influence of environmental factors (mainly humidity) on the gunpowder mechanism, reduce the probability of secondary injury and explosion reaction caused by accidental touch, and avoid the risk of irreversible accidental touch; the gas guide filter plate, the generating column on one side and the diffusion shell on the other side form a multi-stage force transmission amplification system composed of multiple single levels, so that the gas enters the buffer diffusion chamber through the generating gas outlet, the guide filter hole and the gas inlet, and then the high-energy gas generated by the chemical reaction is efficiently converted into mechanical force, the force is amplified and accurately transmitted, and the fixed by-products generated after the gas are filtered through the multi-layer filter to avoid entering the buffer diffusion chamber and then being injected into the air bag or the vehicle to cause secondary injury; the filtered gas is cooled, the airflow speed and pressure are adjusted, and the pressure fluctuation or airflow turbulence caused by high speed is relieved, so as to prevent "explosion" inflation and improve safety; after the one end of the piston body overcomes the elastic force and moves backward to open the gas inlet, the other end also moves backward to open the gas outlet, so that the gas is adjusted in pressure and then enters the exhaust chamber and is uniformly exhausted from the exhaust holes to inflate the air bag and protect the passengers; the device can be reused by refilling after use, and the risk of accidental triggering is reduced to reduce the environmental problem of scrapping. The structure connection and assembly of the gas generating device are stable, the device is easy to place, the safety of the air bag is improved, the environmental impact is reduced, the triggering stability is improved, and the green energy-saving effect is achieved.

[0008] As preferred, the generating shell is provided with a mounting cavity, the generating column is connected with the mounting cavity, one end of the generating column is provided with a catalytic channel, one end of the catalytic channel is connected with the catalyst chamber in communication, and the diaphragm is arranged at the other end of the catalytic channel. The generating column is connected with the mounting cavity in the generating shell, so that the generating column is fixed in the mounting cavity, and the catalytic channel is an elongated channel relative to the catalyst chamber. The effect of ensuring the stability of the sealing and isolation of the diaphragm and preventing leakage is achieved while increasing the pressure of the entering gas into the gas generating chamber.

[0009] As preferred, the gas generating chamber is provided with a positioning groove, the other end of the catalytic channel is arranged at the groove bottom of the positioning groove, and the diaphragm is connected with the positioning groove in a pasting manner. The positioning groove in a sinking manner facilitates the pasting and positioning connection of the diaphragm. The effect of improving the positioning efficiency of the assembly is achieved.

[0010] As preferred, the generating shell is provided with an outer boss, the outer boss is integrally connected with the end face edge of the generating shell, the diffusion shell is provided with an inner boss, the inner boss is integrally connected with the inner side of the end face edge of the diffusion shell, the outer side of the inner boss is recessed to form a connecting groove, and the outer boss is embedded with the connecting groove. The end face edge of the end of the generating shell connected with the diffusion shell is provided with a protruding structure and is arranged as an outer boss, and the inner side of the edge of the diffusion shell is provided with an inner boss. The inner and outer bosses make the end face form a matching annular recess, and the outer side of the inner boss is recessed to form a connecting groove for cooperating with the outer boss. The assembly is prevented from being misaligned, the stability is improved, and the loosening under impact is prevented. The effects of quickly positioning the assembly position of the generating shell and the diffusion shell and enhancing the connection stability of the structure are achieved.

[0011] As preferred, the other end of the generating column is provided with a bottom plate, the bottom plate is integrally connected with the generating column, the gas outlet hole is arranged on the bottom plate, the inner side of the inner boss is provided with a top plate, the top plate is arranged at one end of the generating shell, the top plate is integrally connected with the inner boss, the gas inlet is arranged on the top plate, the cavity between the bottom plate and the gas guiding filter plate is arranged as a primary amplification cavity, and the cavity between the gas guiding filter plate and the top plate is arranged as a secondary amplification cavity. The other end of the generating column is sealed by the integrally connected bottom plate, the gas outlet hole is arranged on the bottom plate, the number of the gas outlet holes matches the number of the gas generating chambers and is arranged at the center of the gas generating chambers, the inner side of the inner boss is sealed to the port of the generating shell by the top plate, the gas inlet is arranged at the center of the top plate, the number and positions of the guiding filter holes, the gas generating holes and the gas inlets are staggered, and the gas passing through the primary amplification cavity and the secondary amplification cavity between the structures enhances the filtering efficiency in the force transmission and step-by-step amplification system. The effects of ensuring the filtering efficiency of the gas generating device and improving the safety of the air bag are achieved.

[0012] As preferred, the guide filter holes are arranged in several, and the guide filter holes are arranged outwardly and evenly from the center of the gas guide filter plate as the origin. The arrangement of the guide filter holes is arranged outwardly and evenly from the center of the gas guide filter plate as the origin, which realizes the effects of uniform air inlet dispersion of the airflow, greater concentration of the guide filter holes opposite to the air inlet to reduce air pressure loss and further ensure the flow rate.

[0013] As preferred, the piston body includes a primary plunger, a secondary plunger, and a connecting rod, the primary plunger is placed in the buffer diffusion chamber, the secondary plunger is placed in the exhaust chamber, one end of the connecting rod is connected with the primary plunger, the other end of the connecting rod passes through the air outlet and is connected with the secondary plunger, the diameter of the primary plunger is 50mm-80mm, the diameter of the secondary plunger is 15mm-30mm, the diameter of the primary plunger is greater than the diameter of the air inlet and is attached to the top plate. The primary plunger and the secondary plunger are both circular plate structures and are respectively connected at the end of the connecting rod, the diameter of the primary plunger is greater than the diameter of the air inlet and is less than the inner diameter of the diffusion shell, the diameter of the secondary plunger is greater than the diameter of the air outlet and is less than the inner diameter of the exhaust chamber, the diameter of the primary plunger and the air inlet is greater than the diameter of the secondary plunger and the air outlet. The effects of realizing two-stage supercharging of the airflow to ensure the inflation speed of the airbag are achieved.

[0014] As preferred, the other end port of the diffusion shell is connected with a support plate, the air outlet is placed on the support plate, the diameter of the secondary plunger is greater than the diameter of the air outlet and is attached to the support plate, the buffer diffusion chamber is provided with an elastic mechanism, one end of the elastic mechanism is connected with the support plate, and the other end of the elastic mechanism is connected with the primary plunger. The support plate at the other port of the diffusion shell isolates the cavities of the diffusion shell and the exhaust shell, the air outlet is placed on the support plate so that the secondary plunger is attached thereto, one end of the elastic mechanism is connected to the support plate, and the other end of the elastic mechanism is connected with the primary plunger and is sleeved on the connecting rod, so that the gas generating device transports gas through a mechanical cylinder structure, which improves safety compared with the traditional gunpowder driven trigger. The effects of improving the stability of the connection and assembly of the structure and ensuring the safety of the device trigger are achieved.

[0015] As preferred, the port where the diffusion shell is connected with the support plate is provided with a necked portion, and the structure shape of the necked portion is inwardly contracted. The port where the diffusion shell is connected with the support plate is provided with a necked portion and the structure is inwardly contracted, so that the cross-sectional shape of the necked portion is wedge-shaped, and the anti-burst design is realized: the neck contraction under the condition of high internal pressure disperses stress through geometric reinforcement (similar to the principle of "arch structure"), prevents the shell from breaking under high pressure, and saves materials, reduces weight and cost, the contracted neck can be used as an interface, which is fixed by welding or pressure bonding, and the assembly precision is improved. The effects of improving practical safety, reducing weight and cost, improving assembly precision, and improving stability of the device are achieved.

[0016] A method for a vehicle safety airbag based on a cylinder trigger, specifically comprising the following steps: Step one: after the vehicle collision, the high-pressure gas mixes with the catalyst in the catalyst chamber, the diaphragm is broken by the gas pressure, and a large amount of gas enters the gas generation chamber through the catalytic channel; Step two: the gas enters the first amplification cavity through the out-gas hole of the bottom plate to increase the force transmission pressure; Step three: the gas enters the second amplification cavity through the guide filter hole of the gas guide filter to increase the force transmission pressure again; Step four: the gas pushes away the first plunger through the gas inlet of the top plate, compresses the elastic mechanism, enters the buffer diffusion chamber, and adjusts the gas pressure by diffusing the gas; Step five: the gas is focused and sprayed through the converging part of the diffusion shell, enters the exhaust chamber through the gas outlet opened by the second plunger, and enters the airbag from the exhaust hole on all sides to achieve rapid and uniform inflation.

[0017] The high-pressure gas breaks the diaphragm with the catalyst, allowing a large amount of gas to enter the gas generation chamber through the catalytic channel. Under the high pressure of a large amount of gas, the gas flow enters the first amplification cavity through the out-gas hole, enters the second amplification cavity through the guide filter hole, and enters the buffer diffusion chamber through the gas inlet. The gas flow is filtered by three layers of the bottom plate, the gas guide filter plate, and the top plate in the force transmission pressure to fix by-products, making the gas flow entering the buffer diffusion chamber cleaner. After entering the gas inlet, the gas flow pushes away the first plunger by overcoming the elastic force of the elastic mechanism, and adjusts the pressure and temperature after entering the buffer diffusion chamber. The gas flow enters the exhaust chamber through the gas outlet opened by the second plunger, and finally inflates the airbag through the exhaust hole to ensure the safety of the passengers. The impact-sensitive cylinder compression mechanism (replacing the gunpowder ignition device) realizes a safe protection mode with high stability and safety.

[0018] The beneficial effects of the present application are: the structure of the gas generation device is stable and easy to place; the safety of the airbag is improved; the environmental impact is reduced to improve the triggering stability; green energy-saving benefits are achieved; the sealing and isolation stability of the membrane is ensured while the gas enters the gas generation chamber, preventing leakage; the assembly positioning efficiency of the parts is improved; the assembly position of the occurrence shell and the diffusion shell is quickly positioned, and the connection stability between the structures is enhanced; the gas flow realizes secondary pressure boosting to ensure the inflation speed of the airbag; the pressure loss is reduced to ensure the flow rate; the practical safety is improved, the weight and cost are reduced, and the assembly precision and device stability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of the present application; Figure 2 is an exploded view of Figure 1 Figure 3 is a side view of Figure 1 ​​Figure 4 is a sectional view of Figure 3 Figure 5 is a sectional view of Figure 4 is an enlarged view of A in Figure 6 is a structural schematic diagram of the connection between the piston body and the elastic mechanism.

[0020] In the figure: 1. Diffusion shell, 2. Buffer diffusion chamber, 3. Air inlet, 4. Air outlet, 5. Generation shell, 6. Generation column, 7. Catalyst chamber, 8. Gas generation chamber, 9. Diaphragm, 10. Exhaust shell, 11. Exhaust chamber, 12. Exhaust hole, 13. Gas guide filter plate, 14. Guide filter hole, 15. Generation air outlet hole, 16. Piston body, 17. Installation cavity, 18. Catalytic channel, 19. Positioning groove, 20. Outer boss, 21. Inner boss, 22. Connection groove, 23. Bottom plate, 24. Top plate, 25. First-stage amplification cavity, 26. Second-stage amplification cavity, 27. First-stage plunger, 28. Second-stage plunger, 29. Connecting rod, 30. Support plate, 31. Elastic mechanism, 32. Closed end. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0022] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0023] ​The relative arrangement of parts, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application unless specifically stated otherwise. Spatially relative terms, such as "upper", "lower", "left", "right", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is inverted, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. It will also be understood that the terms "above", "below", "up", "down", and the like, can be used in this specification to describe features that are closer to or farther from, respectively, an object with respect to a particular orientation (for convenience, referred to herein as the "vertical orientation") unless otherwise stated. The terms "upstream" and "downstream" can be used herein to describe relative positions of elements or features in a fluid flow path. It will be understood that the features are arranged with the referenced flow path in view (for example, whichever direction is designated as "downstream" is the direction in which fluid flows). The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The

[0024] In addition, it should be pointed out that the use of the terms "first", "second", and so on, to qualify parts, is only intended to facilitate the distinction between the corresponding parts, and does not have a special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0025] Example 1: As Figures 1-4As shown in the figure, a kind of device of vehicle safety air bag based on cylinder trigger, including diffusion shell 1, the inner cavity of diffusion shell 1 is set to buffer diffusion chamber 2, diffusion shell 1 one end is equipped with air inlet 3, diffusion shell 1 other end is equipped with air outlet 4;Occur shell 5, occur shell 5 with the one end of diffusion shell 1 by detachable type connection, occur in the shell 5 is connected with occurrence column 6, the inner cavity of occurrence column 6 is equipped with several catalyst chamber 7 and gas generation chamber 8, membrane 9 is equipped between catalyst chamber 7 and gas generation chamber 8, membrane 9 is connected with gas generation chamber 8;Exhaust shell 10, exhaust shell 10 with the other end of diffusion shell 1 by integral type connection, exhaust shell 10 is equipped with exhaust chamber 11, exhaust chamber 11 is communicated with air outlet 4, exhaust chamber 11 is equipped with several exhaust holes 12, gas generation chamber 8, buffer diffusion chamber 2 and exhaust chamber 11 are sequentially communicated;Gas guide filter plate 13, gas guide filter plate 13 with occur shell 5 by integral type connection, gas guide filter plate 13 is equipped with guide filter hole 14, occurrence column 6 is equipped with occurrence air outlet 15, air inlet 3 is placed in the side of guide filter hole 14, occurrence air outlet 15 is placed in the other side of guide filter hole 14;Piston body 16, piston body 16 is elastically connected with diffusion shell 1, one end of piston body 16 is placed in buffer diffusion chamber 2 and is connected with air inlet 3, the other end of piston body 16 is placed in exhaust chamber 11 and is connected with air outlet 4.

[0026] As shown in the figure, Figure 2 , 4 Occur shell 5 is equipped with mounting cavity 17, occurrence column 6 is connected with mounting cavity 17, one end of occurrence column 6 is equipped with catalytic channel 18, one end port of catalytic channel 18 is communicated with catalyst chamber 7, membrane 9 is placed at the other end port of catalytic channel 18.

[0027] As shown in the figure, Figure 4 Gas generation chamber 8 is equipped with positioning groove 19, the other end port of catalytic channel 18 is placed in the groove bottom of positioning groove 19, membrane 9 is attached with positioning groove 19.

[0028] As shown in the figure, Figure 4 , 5 Occur shell 5 is equipped with outer boss 20, outer boss 20 and the end face edge of occur shell 5 are integrally connected, diffusion shell 1 is equipped with inner boss 21, inner boss 21 and the inner side of end face edge of diffusion shell 1 are integrally connected, the outer side of inner boss 21 is recessed and is set as connecting groove 22, outer boss 20 is embedded with connecting groove 22.

[0029] As shown in the figure, Figure 2 , 4As shown, the other end of the generating column 6 is provided with a bottom plate 23, which is integrally connected with the generating column 6, and the gas generating hole 15 is arranged on the bottom plate 23. The inner side of the inner boss 21 is provided with a top plate 24, which is arranged at the end port of the generating shell 5 and is integrally connected with the inner boss 21. The gas inlet 3 is arranged on the top plate 24. The chamber between the bottom plate 23 and the gas guiding filter plate 13 is set as a first-stage amplification chamber 25. The chamber between the gas guiding filter plate 13 and the top plate 24 is set as a second-stage amplification chamber 26.

[0030] As shown in Figure 2 , the guiding filter holes 14 are arranged uniformly outward from the center of the gas guiding filter plate 13 as the origin.

[0031] As shown in Figure 4 , 6 , the piston body 16 includes a first-stage plunger 27, a second-stage plunger 28, and a connecting rod 29. The first-stage plunger 27 is arranged in the buffer diffusion chamber 2. The second-stage plunger 28 is arranged in the exhaust chamber 11. One end of the connecting rod 29 is connected with the first-stage plunger 27. The other end of the connecting rod 29 passes through the gas outlet 4 and is connected with the second-stage plunger 28. The diameter of the first-stage plunger 27 is 50 mm. The diameter of the second-stage plunger 28 is 15 mm. The diameter of the first-stage plunger 27 is larger than that of the gas inlet 3 and is attached to the top plate 24.

[0032] As shown in Figure 2 , 4 , 6, the other end port of the diffusion shell 1 is connected with a support plate 30. The gas outlet 4 is arranged on the support plate 30. The diameter of the second-stage plunger 28 is larger than that of the gas outlet 4 and is attached to the support plate 30. The buffer diffusion chamber 2 is provided with an elastic mechanism 31. One end of the elastic mechanism 31 is connected with the support plate 30. The other end of the elastic mechanism 31 is connected with the first-stage plunger 27.

[0033] As shown in Figure 1 , 4 , the port of the diffusion shell 1 connected with the support plate 30 is provided with a necked portion 32, which is inwardly contracted.

[0034] As shown in Figures 1-6 : The elastic mechanism 31 is a spring structure. Through the use of airbags, acceleration sensors, pressure sensors, and other sensors, the deceleration or impact force of the collision is monitored. When the deceleration exceeds the preset threshold (equivalent to moderate to severe collision), the sensor will send a signal to the control unit within milliseconds. The ECU (Electronic Control Unit) analyzes the sensor data to determine whether the gas generating device is connected with the gas cylinder. The gas cylinder is pre-stored with high-pressure gas. The conclusion is that the ECU triggers the burst valve (or Squib) to release the high-pressure gas in the gas cylinder to provide the driving force for the catalyst to break through the membrane 9.

[0035] The communication channels are left between the gas generating chambers 8 to make the gases exchange with each other, so as to make the gas mixing and distribution in the generating column 6 more uniform.

[0036] The application also provides a method for triggering a vehicle safety airbag based on a gas cylinder, which specifically comprises the following steps. Step one: after the vehicle is hit, the high-pressure gas mixes with the catalyst in the catalyst chamber 7, the diaphragm 9 is broken by the gas pressure, and a large amount of gas enters the gas generating chamber 8 through the catalytic channel 18; Step two: the gas enters the primary amplification cavity 25 through the generating outlet hole 15 of the bottom plate 23 to increase the force transmission pressure; Step three: the gas enters the secondary amplification cavity 26 through the guiding filter hole 14 of the gas guiding filter plate 13 to increase the force transmission pressure again; Step four: the gas pushes away the primary plunger 27 through the gas inlet 3 of the top plate 24, compresses the elastic mechanism 31, enters the buffer diffusion chamber 2, and adjusts the gas pressure through the diffusion of the gas; Step five: the gas is focused and sprayed through the converging part 32 of the diffuser shell, enters the exhaust chamber 11 through the gas outlet 4 opened by the secondary plunger 28, and enters the airbag from the exhaust hole 12 on all sides to achieve rapid and uniform inflation.

[0037] Specific use: after the ECU triggers the release of the high-pressure gas in the gas cylinder, the high-pressure gas breaks the diaphragm 9 with the catalyst in the catalyst chamber 7, a large amount of gas enters the gas generating chamber 8 through the catalytic channel 18, the gas flow enters the primary amplification cavity 25 through the generating outlet hole under the high pressure of a large amount of gas, enters the secondary amplification cavity 26 through the guiding filter hole 14, and enters the buffer diffusion chamber 2 through the gas inlet 3. The gas flow is filtered by the three layers of the bottom plate 23, the gas guiding filter plate 13, and the top plate 24 in the force transmission pressure to fix the by-products, so that the gas flow entering the buffer diffusion chamber 2 is cleaner. After the gas flow enters the gas inlet 3, the primary plunger 27 is pushed away by overcoming the elastic force of the elastic mechanism 31, so that the gas flow entering the buffer diffusion chamber 2 is adjusted by the pressure and temperature after cooperating with the inner cavity environment and the converging part 32. Then the gas flow enters the exhaust chamber 11 through the gas outlet 4 opened by the secondary plunger 28, and finally the gas flow uniformly and stably at moderate pressure is sprayed out of the exhaust hole 12 to inflate the airbag to protect the passengers.

[0038] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for a vehicle airbag based on cylinder triggering, characterized in that, include A diffuser housing (1) is provided with an inner cavity of a buffer diffuser chamber (2), an air inlet (3) is provided at one end of the diffuser housing (1), and an air outlet (4) is provided at the other end of the diffuser housing (1). A generating shell (5) is detachably connected to one end of a diffusion shell (1). A generating column (6) is connected inside the generating shell (5). The inner cavity of the generating column (6) is provided with several catalyst chambers (7) and gas generating chambers (8). A diaphragm (9) is provided between the catalyst chambers (7) and the gas generating chambers (8). The diaphragm (9) is connected to the gas generating chambers (8). The exhaust housing (10) is integrally connected to the other end of the diffuser housing (1). The exhaust housing (10) is provided with an exhaust chamber (11). The exhaust chamber (11) is connected to the air outlet (4). The exhaust chamber (11) is provided with several exhaust holes (12). The gas generating chamber (8), the buffer diffuser chamber (2) and the exhaust chamber (11) are connected in sequence. Gas guide filter plate (13), the gas guide filter plate (13) is integrally connected with the generating housing (5), the gas guide filter plate (13) is provided with guide filter hole (14), the generating column (6) is provided with generating outlet hole (15), the air inlet (3) is located on one side of the guide filter hole (14), and the generating outlet hole (15) is located on the other side of the guide filter hole (14); Piston body (16), the piston body (16) is elastically connected to the diffuser shell (1), one end of the piston body (16) is placed in the buffer diffuser chamber (2) and connected to the air inlet (3), and the other end of the piston body (16) is placed in the exhaust chamber (11) and connected to the air outlet (4).

2. The device for a vehicle airbag based on cylinder triggering according to claim 1, characterized in that, The generating housing (5) is provided with an installation cavity (17), the generating column (6) is connected to the installation cavity (17), one end of the generating column (6) is provided with a catalytic channel (18), one end of the catalytic channel (18) is connected to the catalyst chamber (7), and the membrane (9) is placed at the other end of the catalytic channel (18).

3. The vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, The gas generating chamber (8) is provided with a positioning groove (19), and the other end of the catalytic channel (18) is placed at the bottom of the positioning groove (19). The membrane (9) is attached to the positioning groove (19).

4. The vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, The generating shell (5) is provided with an outer boss (20), and the outer boss (20) is integrally connected to the end face edge of the generating shell (5). The diffusion shell (1) is provided with an inner boss (21), and the inner boss (21) is integrally connected to the inner side of the end face edge of the diffusion shell (1). The outer side of the inner boss (21) is recessed as a connecting groove (22), and the outer boss (20) is engaged with the connecting groove (22).

5. A vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, The other end of the generating column (6) is provided with a base plate (23), the base plate (23) and the generating column (6) are integrally connected, the generating air outlet (15) is placed on the base plate (23), the inner side of the inner boss (21) is provided with a top plate (24), the top plate (24) is placed at one end port of the generating shell (5), the top plate (24) and the inner boss (21) are integrally connected, the air inlet (3) is placed on the top plate (24), the chamber between the base plate (23) and the gas guide filter plate (13) is set as a first-stage amplification chamber (25), and the chamber between the gas guide filter plate (13) and the top plate (24) is set as a second-stage amplification chamber (26).

6. A vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, The guide filter holes (14) are provided in a plurality of manner, and the guide filter holes (14) are arranged evenly outward from the center of the gas guide filter plate (13).

7. A vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, The piston body (16) includes a primary plunger (27), a secondary plunger (28), and a connecting rod (29). The primary plunger (27) is placed in the buffer diffusion chamber (2), and the secondary plunger (28) is placed in the exhaust chamber (11). One end of the connecting rod (29) is connected to the primary plunger (27), and the other end of the connecting rod (29) passes through the exhaust port (4) and is connected to the secondary plunger (28). The diameter of the primary plunger (27) is 50mm~80mm, and the diameter of the secondary plunger (28) is 15mm~30mm. The diameter of the primary plunger (27) is larger than the diameter of the intake port (3) and is in contact with the top plate (24).

8. A vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, A support plate (30) is connected to the other end of the diffusion shell (1). The air outlet (4) is placed on the support plate (30). The diameter of the secondary plunger (28) is larger than the diameter of the air outlet (4) and is in contact with the support plate (30). An elastic mechanism (31) is provided in the buffer diffusion chamber (2). One end of the elastic mechanism (31) is connected to the support plate (30), and the other end of the elastic mechanism (31) is connected to the primary plunger (27).

9. A vehicle airbag device based on cylinder triggering according to claim 1, characterized in that, The port where the diffusion shell (1) connects to the support plate (30) is provided as a constriction part (32), and the constriction part (32) has an inward contraction shape.

10. A method for a cylinder-triggered vehicle airbag, employing the cylinder-triggered vehicle airbag device according to any one of claims 1 to 9, characterized in that, Specifically, the following steps are included: Step 1: After the vehicle crashes, the high-pressure gas mixes with the catalyst in the catalyst chamber (7), and the membrane (9) is ruptured under pressure. A large amount of gas enters the gas generation chamber (8) through the catalyst channel (18). Step 2: Gas enters the primary amplification chamber (25) through the gas generation outlet (15) of the base plate (23) to increase the pressure of force transmission; Step 3: The gas enters the secondary amplification chamber (26) through the guide filter hole (14) of the gas guide filter plate (13) to repressurize the force transmission; Step 4: The gas pushes open the first-stage plunger (27) and the compression elastic mechanism (31) through the air inlet (3) of the top plate (24) and enters the buffer diffusion chamber (2) to adjust the gas pressure during gas diffusion; Step 5: The gas is focused and injected through the constriction part (32) of the diverging shell, enters the exhaust chamber (11) through the exhaust port (4) opened by the secondary plunger (28), and enters the airbag from all sides through the exhaust hole (12) to achieve rapid and uniform inflation.

Images