CN114084094B - Low-cost columnar safety airbag gas generator - Google Patents

Low-cost columnar safety airbag gas generator Download PDF

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Publication number
CN114084094B
CN114084094B CN202111250057.3A CN202111250057A CN114084094B CN 114084094 B CN114084094 B CN 114084094B CN 202111250057 A CN202111250057 A CN 202111250057A CN 114084094 B CN114084094 B CN 114084094B
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China
Prior art keywords
combustion chamber
exhaust
gas
throttle valve
end cover
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CN202111250057.3A
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Chinese (zh)
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CN114084094A (en
Inventor
毛龙
姚俊
胡发灵
王小强
张浩军
黄恩光
宋壬申
贺芷薇
李毅
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Hubei Institute of Aerospace Chemical Technology
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Hubei Institute of Aerospace Chemical Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26011—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a filter through which the inflation gas passes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26064—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow characterised by auto-ignition means

Abstract

The invention provides a low-cost columnar safety airbag gas generator which comprises a cylinder, an electric explosion tube assembly, a gas generating agent, an automatic ignition agent and an exhaust assembly, wherein the electric explosion tube assembly and the exhaust assembly are fixed at ports on two sides of the cylinder; the exhaust assembly comprises a throttle valve, a rupture disc and an exhaust end cover, and a second combustion chamber close to the throttle valve and a third combustion chamber close to the exhaust end cover are separated by the rupture disc; a first combustion chamber is formed between the throttling valve and the blocking piece, gas producing powder and automatic ignition powder are freely dispersed in the first combustion chamber, the gas producing powder is ignited after the electric detonator is ignited, gas is combusted in the first combustion chamber to produce gas, the gas enters the second combustion chamber to enable the pressure in the chamber to rise, so that the rupture disk is exploded, and the gas enters the gas bag from the third combustion chamber. The invention reduces the number of parts, cancels the propellant, connects the electric detonator with the barrel body into a whole by adopting the injection molding process, and has the modularized design of the exhaust component, thereby improving the production efficiency and reducing the cost of the generator.

Description

Low-cost columnar safety airbag gas generator
Technical Field
The invention relates to the field of safety air bag generators for automobiles, in particular to a low-cost columnar safety air bag gas generator which is used for expanding and inflating a safety air bag of an automobile, and particularly relates to a pyrotechnic safety air bag generator for a side air bag.
Background
The safety protection buffer system of the automobile generally comprises an impact sensor, a controller, a gas generator, an air bag and the like, when the automobile is collided, the sensor measures the inertial acceleration generated by the collision of the automobile and transmits a signal to the controller, the controller judges the magnitude and duration of the collision acceleration, if the magnitude and duration of the acceleration exceed or reach a preset limit value, the controller sends an ignition signal to start the gas generator, a large amount of gas is generated after the gas generator is started and filled into the air bag, and the air bag rapidly expands and expands on the side face of a passenger, so that the passenger is prevented from being injured and killed due to the collision of the inertial impact force and other hard objects of the automobile, the injury of the accident to the chest or the head of a human body can be effectively reduced, and the life safety of the driver and the passenger is protected.
With the technical progress, on the premise of meeting the output performance, the cost of the generator is controlled to be higher and higher, the design of the generator is optimized, the cost of the product is reduced, and the competitiveness of the product can be improved. The common gas generator has the principle that an igniter is used for ignition, a booster is used for igniting a booster, the booster is used for igniting a gas producing drug, a large amount of gas is produced after the gas producing drug is combusted, residues are filtered through a filter screen, and then an air bag is inflated. The general columnar generator is equipped with powder transfer and a filter screen, and has the advantages of multiple types of agents, complex structure and higher cost. Chinese patent CN112109657A provides a low-cost columnar gas generator, the main structure of which is that the powder cup is filled with transfer powder and has a fixed cup structure, the blasting disk and the barrel body are welded and fixed, and the filter screen is placed at the lower level of the blasting disk. The technical scheme has the following disadvantages: 1. the structure spare is more, designs the medicine cup and the fixed knot who assembles the priming powder and assembles structure and the fixed knot structure of filter screen. 2. The medicament has multiple types, namely ignition powder, transfer powder, automatic ignition powder and gas production powder. 3. After the rupture disc breaks, the medicament moves fast and burns to the filter screen, and the impact that the removal process produced can cause the explosive grain breakage, influences combustion stability.
Disclosure of Invention
The invention aims to solve the technical problems of reducing parts of a gas generator, reducing the cost of the generator, optimizing an assembly process and providing a low-cost pyrotechnic columnar gas generator which has the advantages of quick initial pressure establishment, low internal pressure of a combustion chamber, stable outlet pressure, good filtration, low outlet temperature, less dust, small volume and low cost, thereby completing the invention.
The technical scheme provided by the invention is as follows:
a low-cost columnar safety airbag gas generator comprises a cylinder body, an electric explosion tube assembly, a gas generating agent 5, an automatic ignition agent and an exhaust assembly, wherein the cylinder body is used as a shell of the gas generator and is of a hollow columnar structure with two open ends; the electric explosion tube assembly is fixed at one side port of the barrel 4 in a clamping edge, welding or injection molding mode and comprises an electric explosion tube 1, a spring 2 and a baffle plate, wherein one end of the spring is sleeved on the periphery of the electric explosion tube 1, and the other end of the spring is propped against the end face of the baffle plate 3; the exhaust assembly is fixed at the other side port and comprises a throttle valve 7, a rupture disk 8 and an exhaust end cover 9, the throttle valve and the exhaust end cover 9 are enclosed to form a combustion-exhaust cavity, the rupture disk 8 is positioned between the throttle valve 7 and the exhaust end cover 9 and divides the combustion-exhaust cavity into a second combustion chamber 42 close to the throttle valve 7 and a third combustion chamber 43 close to the exhaust end cover 9; a first combustion chamber 41 is formed between the throttle valve 7 and the baffle 3, the gas producing powder 5 and the automatic ignition powder 6 are freely dispersed in the first combustion chamber 41 and are pressed by the baffle 3, the gas producing powder 5 is ignited after the electric explosion tube 1 is ignited, gas is combusted and produced in the first combustion chamber 41, the gas enters the second combustion chamber 42 to cause the pressure in the chamber to rise so as to cause the explosion piece 8 to explode, and the gas enters the air bag from the second combustion chamber 42 through the third combustion chamber 43.
The low-cost columnar safety airbag gas generator provided by the invention has the following beneficial effects:
(1) According to the low-cost columnar safety airbag gas generator provided by the invention, the electric explosion tube assembly is fixedly connected with the barrel body in a clamping and welding mode, and an injection molding process is adopted after the clamping and welding, or the integral injection molding mode is directly adopted to be fixedly connected with the barrel body, so that the cost is reduced, and the sealing reliability of the barrel body is improved;
(2) The low-cost columnar safety airbag gas generator provided by the invention has no filter screen design, and through the structural design of the exhaust assembly, gas forms first filtration through a gap between the throttle valve and the cylinder body; the fuel gas is bent at the punching position of the throttle valve to form secondary filtration, and is bent and discharged through the exhaust port of the exhaust end cover hole to carry out tertiary filtration, so that the structural design is simplified;
(3) According to the low-cost columnar safety airbag gas generator provided by the invention, no transfer powder is needed, the structural design for fixing the transfer powder is not needed, the structure is further simplified, and the cost is reduced;
(4) According to the low-cost columnar safety airbag gas generator provided by the invention, the modular design of the exhaust assembly improves the assembly efficiency and the sealing reliability; the design of the rupture disk is selected, so that the consistency of initial ignition internal pressure and high-low temperature combustion is improved;
(5) According to the low-cost columnar safety airbag gas generator provided by the invention, the medicament does not generate impact when working, the mesoporous medicament is used as a gas generating medicament, the internal pressure of the generator is lower, and the combustion stability is improved.
Drawings
FIG. 1 is a schematic structural view of a cylindrical airbag inflator according to the present invention, in which an squib assembly is connected to a barrel body in a snap-in manner;
FIG. 2 is a schematic structural view of a cylindrical airbag inflator according to the present invention, in which an squib assembly is connected to a cylinder by welding;
FIG. 3 is a schematic view showing a structure of a cylindrical airbag inflator according to the present invention, in which an squib assembly is coupled to a cylinder by injection molding;
FIG. 4 is a block diagram of a snap-edge injection molded squib assembly;
FIG. 5 is a block diagram of a welded injection molded squib assembly;
FIG. 6 is a block diagram of an integrally injection molded squib assembly;
FIG. 7 is a block diagram of an exhaust assembly;
fig. 8 is a schematic view showing the operation of the pillar airbag inflator.
Description of the reference numerals
1, electrically exploding a tube; 2-a spring; 3-a baffle plate; 4-a cylinder body; 5-gas producing medicine; 6-automatic ignition powder; 7-a throttle valve; 8-rupture disk; 9-exhaust end cap; 11-a circular metal base; 12-injection molding I; 13-injection molding II; 14-zigzag metal base; 15-injection molding III; 41-a first combustion chamber; 42-a second combustion chamber; 43-third combustion chamber.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a low-cost columnar safety airbag gas generator, which comprises a cylinder body 4, an electric explosion tube assembly, a gas generating agent 5, an automatic ignition agent 6 and an exhaust assembly, wherein the cylinder body 4 is used as a shell of the gas generator and is of a hollow columnar structure with two open ends; the electric explosion tube assembly is fixed at one side port of the barrel 4 in a clamping, welding or injection molding mode and comprises an electric explosion tube 1, a spring 2 and a baffle 3, one end of the spring 2 is sleeved on the periphery of the electric explosion tube 1, and the other end of the spring is propped against the end face of the baffle 3; the exhaust assembly is fixed at the other side port of the cylinder 4 and comprises a throttle valve 7, a rupture disk 8 and an exhaust end cover 9, the throttle valve 7 and the exhaust end cover 9 enclose a combustion-exhaust cavity, the rupture disk 8 is positioned between the throttle valve 7 and the exhaust end cover 9 and divides the combustion-exhaust cavity into a second combustion chamber 42 close to the throttle valve 7 and a third combustion chamber 43 close to the exhaust end cover 9; a first combustion chamber 41 is formed between the throttle valve 7 and the baffle 3, the gas producing powder 5 and the automatic ignition powder 6 are freely dispersed in the first combustion chamber 41 and are pressed by the baffle 3, the gas producing powder 5 is ignited after the electric explosion tube 1 is ignited, gas is combusted and produced in the first combustion chamber 41, the gas enters the second combustion chamber 42 to cause the pressure in the chamber to rise so as to cause the explosion piece 8 to explode, and the gas enters the air bag from the second combustion chamber 42 through the third combustion chamber 43.
In a preferred embodiment, as shown in fig. 4, one end of the cylinder 4 is closed, so that the cylinder 4 is fixedly connected with the electric detonator assembly in a clamping edge manner. The electric detonator component also comprises an annular metal base 11 and an injection molding piece I12, wherein the annular metal base 11 is fixed on the periphery of pins of the electric detonator 1, an inner hole is polygonal, the electric detonator 1 is prevented from rotating after injection molding, the diameter of an external circle of the inner hole is smaller than the outer diameter of the electric detonator 1, the electric detonator plays a supporting role when bearing internal pressure and is larger than the distance between the pins of the electric detonator 1, and short circuit is prevented; annular grooves are processed on the inner end face and the outer end face of the annular metal base 11, the width of each groove is 0.5-2 mm, and the depth of each groove is 0.5-1.5 mm; the injection molding I12 is formed on the electric detonator 1 and the annular metal base 11 in an injection molding mode, and the electric detonator and the annular metal base are connected into a whole and matched with the inner surface of the cylinder 4 to seal the port of the cylinder 4. One end of the injection molding I12 close to the first combustion chamber is sleeved with an O-shaped ring for improving the sealing performance of the port, an outward-turned convex edge is formed at the tail end, the outer diameter of the convex edge is larger than the inner diameter of the cylinder body 4 and smaller than the outer diameter of the cylinder body 4, and the convex edge and the port with the edge are axially limited.
When the electric detonator component is fixed to the cylinder body 4, the electric detonator 1 and the annular metal base 11 are molded into a whole by injection, an O-shaped ring is sleeved on an injection molding piece I12 and then arranged at one end of the cylinder body 4, and a port is connected with a clamping edge of the electric detonator component after being tightened.
In a preferred embodiment, as shown in fig. 5, the squib assembly is fixedly connected to the barrel 4 by welding. The electric detonator component also comprises a V-shaped metal base 14 and an injection molding part II 13, wherein the V-shaped metal base 14 is fixed on the periphery of a pin of the electric detonator 1, the middle waist section is attached to the inner surface of the cylinder body 4, and the everted part at the bottom end is butted with the end surface of the cylinder body 4 and is welded and fixed; the head of the n-shaped metal base 14 is provided with an inner hole which is polygonal, and the diameter of the circumscribed circle of the inner hole is smaller than the outer diameter of the electric detonator 1 and larger than the pin pitch of the electric detonator 1; annular grooves are processed on the inner side end face and the outer side end face of the head of the V-shaped metal base 14, the width of each groove is 0.5 mm-2 mm, and the depth of each groove is 0.5 mm-1.5 mm; the injection molding II 13 is formed on the electric detonator 1 and the n-shaped metal base 14 in an injection molding mode and connects the electric detonator 1 and the n-shaped metal base into a whole.
When the electric detonator component is fixed to the barrel 4, the electric detonator component is connected with the barrel through the circular welding of the V-shaped metal base, and then the electric detonator is molded into a whole by injection molding.
In a preferred embodiment, as shown in fig. 6, the squib assembly is fixedly attached to the barrel 4 by injection molding. The electric detonator component also comprises an injection molding piece III 15, the end part of the cylinder body 4 is processed into a bottom structure, the center of the bottom structure is provided with an inner hole for extending out a pin of the electric detonator 1, the inner hole is polygonal, and the diameter of the circumscribed circle of the inner hole is smaller than the outer diameter of the electric detonator 1 and larger than the distance between the pins of the electric detonator 1; the bottom structure of the cylinder body 4 is provided with an annular groove, a plurality of through holes with the aperture phi of 2-4 are formed in the annular groove, and the annular groove is arranged on the periphery of the through holes. The injection molding piece III 15 is used for fixedly connecting the electric detonator 1 with the bottom of the cylinder body 4 in an injection molding mode.
In a preferred embodiment, as shown in fig. 7, the throttle valve 7 and the exhaust end cover 9 are U-shaped structures with opposite open ends, the outer diameters of the open ends of the two U-shaped structures are increased to form a large end for forming transition fit with a port of the cylinder 4, and the large end of the exhaust end cover 9 is welded with the port of the cylinder 4 to implement port sealing; an air inlet is formed in the small end of the throttle valve 7, a gap is formed between the air inlet and the inner diameter of the cylinder, and an air outlet is formed in the small end of the air outlet end cover 9 and used for exhausting air; the rupture disk 8 is in an integral structure at the middle position of the exhaust end cover 9 and the throttle valve 7 through laser welding. The rupture disk is arranged in the middle of the exhaust end cover and the throttle valve, the three parts are connected into a component through laser welding, the throttle valve does not need to be fixed, and the assembly manufacturability of the product is improved.
Preferably, the valve gap between the throttle valve 7 and the inner diameter of the cylinder 4 performs a filtering function, and reducing the gap size or increasing the gap length can improve the filtering efficiency. Experiments prove that the inner diameter clearance between the throttle valve 7 and the barrel 4 is 0.5 mm-1.5 mm, the clearance length is more than 15mm, and the filtering effect can be achieved.
Preferably, the length H from the center of the exhaust port of the exhaust end cover 9 to the rupture disk 8 is greater than the rupture disk radius R1.2, and R1.2 is less than (the length H from the center of the exhaust port to the inner side surface of the exhaust end cover + the inner diameter R of the exhaust end cover). The exhaust end cover and the throttle valve can have the same size structure, and the purpose of reducing cost is achieved. The design of the exhaust port of the exhaust end cover ensures that the petals do not block the hole after the rupture disk is exploded, the rupture disk is not blocked after being integrally separated, and the safety of the gas generator is ensured in design.
Preferably, the rupture disk 8 is provided with a plurality of notches which are uniformly distributed, so that the rupture pressure of the rupture disk 8 is 10MPa-25MPa.
In a preferred embodiment, the gas generator has no propellant, the electric detonator 1 directly ignites the gas generating agent 5, and the electric detonator has a loading of 180 mg-500 mg. The invention has no structure for assembling the powder transfer and installing the powder transfer, simplifies the design and reduces the cost. Due to the adoption of the design without the propellant, the rupture disk can improve the initial combustion internal pressure and the combustion speed, and the rupture disk can increase the initial combustion surface by combining the appropriate rupture disk burst pressure and is beneficial to solving the problem of the combustion consistency of the high and low temperatures of the generator.
In a preferred embodiment, the gas generant composition 5 is a columnar mesoporous structure having an inner diameter of 1.5mm to 2.5mm, an outer diameter of 4.0mm to 7mm, and a height of 3mm to 6mm. The internal pressure of the generator can be effectively reduced by selecting the mesoporous medicine, so that the cylinder body can be made of thinner steel pipes or seamed steel pipes, and the cost is reduced.
As shown in fig. 8. When the gas generator works, the electric detonator 1 receives a current pulse signal, the gas generating agent 5 is ignited after detonation, the generated gas is in the first combustion chamber 41 and the second combustion chamber 42, the internal pressure of the gas generator is rapidly increased, and the rupture disk 8 is exploded at the weak position of the notch groove to be in a petal shape. The gas passes through the gap between the throttle valve 7 and the cylinder 4 to form the first filtration. The gas is turned at the position of the air inlet of the throttle valve 7 to form secondary filtration. After the incompletely combusted gas is continuously combusted in the second combustion chamber 42 and the third combustion chamber 43, the incompletely combusted gas is bent and discharged through an exhaust port of the exhaust end cover 9 to be filtered for the third time and enters the air bag.
Examples
Example 1
As shown in fig. 1, 4 and 7, the gas generator is provided with an electric detonator 1, a spring 2, a baffle 3, a cylinder 4, a gas generating charge 5, an automatic ignition charge 6, a throttle valve 7, a rupture disk 8 and an exhaust end cover 9 in sequence from left to right. The electric explosion tube 1 is located at the left end of the tube body 4 and is connected with the edge of the tube body 4, and the exhaust end cover 9 is welded with the right side of the tube body 4 and is located at the right end of the tube body 4. A first combustion chamber 41 is formed between the throttle valve 7 and the baffle 3, and the gas generant composition 5 and the autoignition composition 6 are freely dispersed in the first combustion chamber 41.
The rupture disk 8 of the throttle valve 7 and the exhaust end cover 9 are assembled together and welded into a whole by adopting a laser welding or energy storage welding mode to form an exhaust assembly. The outer diameter of the exhaust component is in tight fit connection with the inner diameter of the cylinder, the exhaust component is welded on the cylinder 4 after assembly, the gap between the throttle valve 7 and the inner diameter of the cylinder 4 is 0.5-1.5 mm after assembly, the gap length is larger than 15mm, the length H from the center of an exhaust port of the exhaust end cover 9 to the rupture disk 8 is larger than the radius R of the rupture disk by 1.2, and R is smaller than (the length H from the center of the exhaust port to the inner side surface of the exhaust end cover plus the inner diameter R of the exhaust end cover). Assembling an automatic ignition powder 6 and a gas production powder 5, installing a separation blade 3 and a spring 2, sleeving an O-shaped ring into the electric squib 1 after injection molding, assembling the electric squib into the cylinder, closing the edge of the cylinder 4, and axially limiting the convex edge of the injection molding I12 to complete the assembly.
Example 2
As shown in fig. 2, 5 and 7, the gas generator is provided with an electric squib 1, a spring 2, a baffle 3, a cylinder 4, a gas generating charge 5, an automatic ignition charge 6, a throttle valve 7, a rupture disk 8 and an exhaust end cover 9 in sequence from left to right. The electric detonator 1 of moulding plastics is located the left end of barrel 4, and with barrel 4 welded connection, and exhaust end cover 9 is in the same place with 4 right side welding of barrel, is located the right-hand member of barrel 4. A first combustion chamber 41 is formed between the throttle valve 7 and the baffle 3, and the gas generant composition 5 and the autoignition composition 6 are freely dispersed in the first combustion chamber 41.
The throttle valve 7, the rupture disk 8 and the exhaust end cover 9 are assembled together and welded into a whole in a laser welding or energy storage welding mode to form an exhaust assembly. The outer diameter of the exhaust component is tightly matched and connected with the inner diameter of the cylinder body, the exhaust component is welded on the cylinder body 4 after assembly, the clearance between the throttle valve 7 and the inner diameter of the cylinder body 4 is 0.5-1.5 mm after assembly, the length of the clearance is larger than 15mm, the length H from the center of an exhaust port of the exhaust end cover 9 to the rupture disk 8 is larger than the radius R of the rupture disk by 1.2, and R1.2 is smaller than (the length H from the center of the exhaust port to the inner side surface of the exhaust end cover + the inner diameter R of the exhaust end cover). Assembling the automatic ignition powder 6 and the gas production powder 5, installing the baffle 3 and the spring 2, welding the n-shaped metal base 14 and the cylinder 4 together, and connecting the electric detonator 1 with the base through an injection molding process.
Example 3
As shown in fig. 3, 6 and 7, the gas generator is provided with an electric detonator 1, a spring 2, a baffle 3, a cylinder 4, a gas generating charge 5, an automatic ignition charge 6, a throttle valve 7, a rupture disk 8 and an exhaust end cover 9 in sequence from left to right. The electric explosion tube 1 is located at the left end of the cylinder body 4 and is molded together with the cylinder body 4, and the exhaust end cover 9 is welded together with the right side of the cylinder body 4 and is located at the right end of the cylinder body 4. A first combustion chamber 41 is formed between the throttle valve 7 and the baffle 3, and the gas generant composition 5 and the autoignition composition 6 are freely dispersed in the first combustion chamber 41.
The throttle valve 7, the rupture disk 8 and the exhaust end cover 9 are assembled together and welded into a whole in a laser welding or energy storage welding mode to form an exhaust assembly. The outer diameter of the exhaust component is tightly matched and connected with the inner diameter of the cylinder body, the exhaust component is welded on the cylinder body 4 after assembly, the gap between the throttle valve 7 and the inner diameter of the cylinder body 4 is 0.5-1.5 mm after assembly, the length of the gap is larger than 15mm, the length H from the exhaust port center of the exhaust end cover 9 to the rupture disk 8 is larger than the radius R1.2 of the rupture disk, and R1.2 is smaller than (the length H from the exhaust port center to the inner side surface of the exhaust end cover + the inner diameter R of the exhaust end cover). Assembling an automatic ignition powder 6 and a gas generating powder 5, installing a separation blade 3, a spring 2 and an electric detonator 1, and connecting the electric detonator 1 with a cylinder body 4 through an injection molding process.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the embodiments and implementations of the invention without departing from the spirit and scope of the invention, and are within the scope of the invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.

Claims (8)

1. A low-cost columnar safety airbag gas generator is characterized by comprising a cylinder body (4), an electric explosion tube assembly, gas producing powder (5), automatic ignition powder (6) and an exhaust assembly, wherein no transfer powder exists, and the cylinder body (4) is used as a shell of the gas generator and is of a hollow columnar structure with openings at two ends; the electric explosion tube assembly is fixed at one side port of the barrel (4) in a clamping, welding or injection molding mode and comprises an electric explosion tube (1), a spring (2) and a baffle (3), one end of the spring (2) is sleeved on the periphery of the electric explosion tube (1), and the other end of the spring is propped against the end face of the baffle (3); the exhaust assembly is fixed at the other side port and comprises a throttle valve (7), a rupture disc (8) and an exhaust end cover (9), the throttle valve (7) and the exhaust end cover (9) are enclosed to form a combustion-exhaust cavity, the rupture disc (8) is positioned between the throttle valve (7) and the exhaust end cover (9) and divides the combustion-exhaust cavity into a second combustion chamber (42) close to the throttle valve (7) and a third combustion chamber (43) close to the exhaust end cover (9); a first combustion chamber (41) is formed between the throttle valve (7) and the baffle plate (3), gas producing powder (5) and automatic ignition powder (6) are freely dispersed in the first combustion chamber (41) and are pressed by the baffle plate (3), the gas producing powder (5) is ignited after the electric detonator (1) is ignited, gas is combusted and produced in the first combustion chamber (41), the gas enters a second combustion chamber (42) to increase the pressure in the chamber to cause the rupture disk (8) to be ruptured, and the gas enters the air bag from the second combustion chamber (42) through a third combustion chamber (43);
the throttle valve (7) and the exhaust end cover (9) are of U-shaped structures with opposite opening ends, the outer diameters of the opening ends of the two U-shaped structures are increased to form large ends which are used for forming transition fit with the port of the cylinder body (4), and the large ends of the exhaust end cover (9) are connected with the port of the cylinder body (4) in a welding mode to seal the port; an air inlet is formed in the small end of the throttle valve (7), a gap is formed between the air inlet and the inner diameter of the cylinder, and an air outlet is formed in the small end of the air outlet end cover (9) and used for exhausting air; the rupture disk (8) is arranged in the middle of the exhaust end cover (9) and the throttle valve (7) and is welded into an integral structure, and the bursting pressure of the rupture disk (8) is 10MPa-25MPa; the clearance between the throttle valve (7) and the inner diameter of the cylinder body (4) is 0.5-1.5 mm, and the length of the clearance is more than 15mm; the gas passes through the gap between the throttle valve (7) and the cylinder body (4) to form primary filtration, the gas is turned at the position of the air inlet of the throttle valve (7) to form secondary filtration, and the incompletely combusted gas is continuously combusted in the second combustion chamber (42) and the third combustion chamber (43), then is turned and exhausted through the exhaust port of the exhaust end cover (9) to perform tertiary filtration and enters the air bag;
the length H from the center of the exhaust port of the exhaust end cover (9) to the rupture disk (8) is greater than the radius R1.2 of the rupture disk, and R1.2 is less than the sum of the length H from the center of the exhaust port to the inner side surface of the exhaust end cover and the inner diameter R of the exhaust end cover.
2. The low-cost cylindrical airbag inflator of claim 1, wherein the barrel (4) is closed at one end, so that the barrel (4) is fixedly connected with the squib assembly in an edge clamping manner; the electric detonator component also comprises an annular metal base (11) and an injection molding piece I (12), wherein the annular metal base (11) is fixed on the periphery of pins of the electric detonator (1), an inner hole is polygonal, and the diameter of an external circle of the inner hole is smaller than the outer diameter of the electric detonator (1) and larger than the pin interval of the electric detonator (1); the injection molding I (12) is formed on the electric detonator (1) and the annular metal base (11) in an injection molding mode, and the electric detonator and the annular metal base are connected into a whole and matched with the inner surface of the cylinder body (4) to seal the port of the cylinder body (4).
3. The low-cost cylindrical airbag gas generator as claimed in claim 2, characterized in that the inner and outer end faces of the circular ring-shaped metal base (11) are processed with circular grooves, the width of the groove is 0.5 mm-2 mm, and the depth of the groove is 0.5 mm-1.5 mm; one end of the injection molding piece I (12) close to the first combustion chamber is sleeved with an O-shaped ring, an outward-turned convex edge is formed at the tail end, and the outer diameter of the convex edge is larger than the inner diameter of the cylinder body (4) and smaller than the outer diameter of the cylinder body (4).
4. The low-cost cylindrical airbag inflator according to claim 1, wherein the squib assembly is fixedly connected to the cylinder (4) by welding; the electric detonator component also comprises a V-shaped metal base (14) and an injection molding part II (13), wherein the V-shaped metal base (14) is fixed on the periphery of a pin of the electric detonator (1), the middle waist section is attached to the inner surface of the barrel body (4), and the outward turning part at the bottom end is butted with the end face of the barrel body (4) and is welded and fixed; an inner hole is formed in the head of the n-shaped metal base (14), the inner hole is polygonal, and the diameter of an outer circle of the inner hole is smaller than the outer diameter of the electric detonator (1) and larger than the pin pitch of the electric detonator (1); the injection molding part II (13) is formed on the electric detonator (1) and the n-shaped metal base (14) in an injection molding mode and is connected with the electric detonator and the n-shaped metal base into a whole.
5. The low-cost cylindrical air bag gas generator according to claim 4, wherein the inner and outer side end surfaces of the head of the metal base (14) in a shape of a Chinese character 'ji' are formed with annular grooves having a width of 0.5mm to 2mm and a depth of 0.5mm to 1.5mm.
6. The low-cost cylindrical airbag gas generator as claimed in claim 1, wherein the squib assembly is fixedly connected with the cylinder body (4) by injection molding, the squib assembly further comprises an injection molding piece III (15), the end part of the cylinder body (4) is processed into a bottom structure, the center of the bottom structure is provided with an inner hole for extending a pin of the squib (1), the inner hole is polygonal, and the diameter of the circumcircle of the inner hole is smaller than the outer diameter of the squib (1) and larger than the pin interval of the squib (1); the injection molding piece III (15) fixedly connects the electric detonator (1) with the bottom of the cylinder body (4) in an injection molding mode.
7. The low-cost cylindrical airbag gas generator as claimed in claim 6, wherein the bottom structure of the cylinder (4) is provided with an annular groove and a plurality of through holes, and the annular groove is arranged at the periphery of the through holes.
8. The low-cost cylindrical airbag gas generator according to claim 1, wherein the rupture disk (8) is designed with a plurality of uniformly distributed notches, so that the rupture pressure of the rupture disk (8) is 10-25 MPa.
CN202111250057.3A 2021-10-26 2021-10-26 Low-cost columnar safety airbag gas generator Active CN114084094B (en)

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5531473A (en) * 1994-05-31 1996-07-02 Morton International, Inc. Fluid fuel-containing initiator device for an air bag inflator
US6073963A (en) * 1998-03-19 2000-06-13 Oea, Inc. Initiator with injection molded insert member
JP4426079B2 (en) * 1999-09-27 2010-03-03 ダイセル化学工業株式会社 Initiator assembly
CN105984419B (en) * 2015-01-29 2018-10-30 湖北航天化学技术研究所 A kind of gas generator
CN205615467U (en) * 2016-04-24 2016-10-05 高田（长兴）汽车安全装置有限公司 Knee protection gas generator for air bag
CN105799636B (en) * 2016-06-01 2018-05-25 东方久乐汽车安全气囊有限公司 A kind of sealing structure between gas generator shell and igniter
JP6691442B2 (en) * 2016-06-27 2020-04-28 株式会社ダイセル Gas generator
DE102016123312A1 (en) * 2016-12-02 2018-06-07 Trw Airbag Systems Gmbh GAS GENERATOR, GAS TANK MODULE AND VEHICLE SAFETY SYSTEM

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