CN109927664B - Two-stage gas generator - Google Patents
Two-stage gas generator Download PDFInfo
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- CN109927664B CN109927664B CN201910273062.2A CN201910273062A CN109927664B CN 109927664 B CN109927664 B CN 109927664B CN 201910273062 A CN201910273062 A CN 201910273062A CN 109927664 B CN109927664 B CN 109927664B
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Abstract
A two-stage gas generator includes a first combustion chamber and a second combustion chamber which are not communicated with each other; the two combustion chambers are arranged in an accommodating cavity formed by the upper shell and the lower shell; the upper shell is provided with an exhaust hole; the second combustion chamber comprises a second ignition system and a second gas generating agent filled in the second ignition system; the first combustion chamber comprises a filtering system, a first ignition system and a first gas generating agent; the filtering system comprises a filter screen and a supporting device; two ends of the filter screen are abutted between the upper shell and the supporting device on the lower shell; the first ignition system and the second ignition system are arranged on the lower shell and are arranged in a cavity formed between the filtering system and the lower shell; the first gas generating agent is filled in the cavity between the first ignition system and the second combustion chamber and between the upper shell and the filtering system.
Description
Technical Field
The present invention relates to gas generators for use in restraint devices for vehicles and the like, and in particular to gas generators having one or more combustion chambers, and more particularly to "two stage" gas generators having 2 stages of combustion chambers.
Background
A restraint device for a vehicle or the like generally uses a gas generator to generate gas for restraining inflation of an airbag at the time of a collision. Due to the complex situation of the vehicle in the collision, the two-stage gas generator with the 2-stage combustion chamber has the advantages that the output performance parameters can be selectively changed according to the collision strength, the speed and the like. At the same time, however, such gas generators have a more complex structure and a greater weight due to use and performance requirements, which increases the complexity of the design, additional parts, and associated manufacturing costs.
CN106660510A describes a gas generator structure having 2 combustion chambers, wherein the combustion chambers have a cup member and tube member combination. Fig. 1(a) shows a cup member having a non-stepped slit 136, a connecting slit, and an introducing slit. Fig. 1(b) shows a barrel member, and the barrel member 141 has 2 protrusions 142 protruding outward in the radial direction. During assembly, the cup member can be pressed after the guiding slit is aligned with the projection 142 of the barrel member, then the cup member rotates anticlockwise to the anti-falling slit 136 along the connecting slit, and then the cup member moves downwards along the axis until the projection 142 abuts against one end of the anti-falling slit 136; in operation, the cup member moves upward along the anti-trip slit 136 until the protrusion 142 abuts the other end of the anti-trip slit 136 and the through hole of the cup member is exposed. Due to the design, the structure of the combustion chamber is complex, and meanwhile, the cup component cannot be fixed in position and also has the defect of moving along the axial direction and the circumferential direction under the vibration condition, so that the hidden danger that the cup component cannot work according to the design can be brought.
CN105644491B describes a secondary delay detonation inflatable gas generator structure. As shown in fig. 2, both sides of the upper casing 2 are respectively provided with a filter 16, the bottom of the lower casing 1 is provided with a filter gasket 17, the bottom of the upper casing is provided with an elastic gasket 18 for supporting the filter, and the outer side surface of the elastic gasket is attached to the bottom surface of the upper casing. At this time, the filter is axially fixed by the end faces abutting against the bottom face of the upper housing and the filter gasket, respectively, but the filter with such a structural design is high in height, which indirectly increases the weight of the gas generator.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides a two-stage gas generator.
The technical solution of the invention is as follows: a two-stage gas generator includes a first combustion chamber and a second combustion chamber which are not communicated with each other; the two combustion chambers are arranged in an accommodating cavity formed by the upper shell and the lower shell; the upper shell is provided with an exhaust hole;
the second combustion chamber comprises a second ignition system and a second gas generating agent filled in the second ignition system; the first combustion chamber comprises a filtering system, a first ignition system and a first gas generating agent; the filtering system comprises a filter screen and a supporting device; two ends of the filter screen are abutted between the upper shell and the supporting device on the lower shell;
the first ignition system and the second ignition system are arranged on the lower shell and are arranged in a cavity formed between the filtering system and the lower shell; the first gas generating agent is filled in the cavity between the first ignition system and the second combustion chamber and between the upper shell and the filtering system.
Preferably, the supporting device is a supporting ring, and the supporting ring comprises a circular plane and a plurality of claws arranged on the circular plane; the circular plane is used as a second horizontal step, and two ends of the filter screen are abutted between the second horizontal step and the upper shell; the clamping jaw comprises a first horizontal step and a vertical wall; the vertical wall is arranged at a right angle with the first horizontal step and the second horizontal step; the first horizontal step is arranged on the end face of the vertical opening of the lower shell, the length of the vertical wall is adjusted according to the charging amount of the first gas generating agent, and the vertical wall is in contact with the inner wall of the lower shell.
Preferably, the at least two clamping jaws are uniformly distributed along the second horizontal step, and a strip-shaped gap is formed between the vertical wall of each clamping jaw and the outer wall of the filter screen.
Preferably, the supporting device is a step protruding from the inner wall of the lower shell, the height of the step is designed according to the charging amount of the first gas generating agent, and the step and the lower shell are integrally designed.
Preferably, the lower shell is in a barrel shape and is provided with a plane closed end and a vertical open end, the step is arranged on the inner ring surface of the vertical open end, and a groove with the same width as the step is formed between the step position and the vertical open end.
Preferably, the step is formed by stamping and cold/warm extrusion.
Preferably, at least two steps are uniformly distributed along the circumference of the inner wall of the lower shell, and strip-shaped gaps are formed among the steps, the grooves and the outer wall of the filter screen.
Preferably, the filter screen is an annular filter screen; the outer periphery of filter screen has right angle end and fillet end, the right angle end supports and leans on support ring or step plane, the fillet end with go up casing top inner wall butt.
Preferably, the second ignition system comprises an igniter, an ignition shell and a bursting plate for establishing gas pressure and a gas flow channel;
the igniter is located at one end of the ignition shell, the explosion plate is located at the other end of the ignition shell, and the explosion plate is fixed at the end part of the ignition shell.
Preferably, the shape of the blast plate consists of a circular arch with a convex middle part and a circular ring connected with the edge of the circular arch; the thickness of the center of the circular arch is the minimum, the outer diameter of the circular ring is equal to or smaller than the outer diameter of the ignition shell, and the direction of the circular arch is opposite to the direction of the igniter.
Preferably, the blast plate is barrel-shaped and is provided with a closed end and an open end turned outwards;
the middle part of the closed end is in a circular arch shape, the closed end faces the direction of the igniter, and the direction of the circular arch is opposite to the direction of the igniter;
the direction of the opening end is opposite to the direction of the igniter, the maximum diameter of the opening end is equal to or less than the outer diameter of the ignition shell, a plurality of communicating holes are arranged on the circumferential wall of the opening end, sealing foils are stuck on the surface of the circumferential wall, and the outer diameter of the circumferential wall is equal to or less than the inner diameter of the ignition shell.
Preferably, the material of the sealing foil is stainless steel, copper or aluminum.
Preferably, the number of the strip-shaped gaps is selected from 6-20.
Preferably, the number of the strip-shaped gaps is selected within the range of 10-16.
Compared with the prior art, the invention has the beneficial effects that:
(1) the gas generator provided by the invention has the advantages of simpler structure, less part quantity, motor-driven adjustment of the gas generating agent loading quantity, no mutual interference between the first combustion chamber and the second combustion chamber, and more stable and reliable performance.
(2) Under the condition of not changing the volume of the gas generator, the volume of the charge space of the first combustion chamber can be adjusted by simply adjusting the height of the annular saw-tooth-shaped support ring or the height of the saw-tooth step of the lower shell to adjust the height of the annular filter screen. The filter section that has not only guaranteed that the annular filter screen is located the exhaust hole position of last casing makes full use of, reduces filter screen length, and then alleviates whole gas generator's weight, still saves some lower housing space and is used for adjusting the charge of first gas generant, reaches the purpose of adjusting "level 1" combustion chamber output performance.
(3) The filtering system of the invention not only can adsorb solid residues and reduce the gas temperature, but also increases the gas flowing channel and space by a plurality of strip-shaped gaps, thereby playing the role of reducing the internal pressure of the combustion chamber. Therefore, on the premise of ensuring the safety coefficient of the gas generator, under the condition of the same charging amount and the same output performance, the gas generator can use a shell material with thinner thickness, lower mechanical performance and lower price, so that the weight of the whole gas generator is reduced, and the design and purchase cost is reduced.
(4) The output pressure and time control of the second combustion chamber are more accurate and reliable. According to the requirement of output performance, the explosion strength of the explosion plate can be accurately calculated by only selecting proper materials and adjusting the radius and the plate thickness of the preformed circular arch of the explosion plate, and the explosion plate is broken as long as the pressure in the second combustion chamber is increased to the preset explosion strength of the explosion plate during working. The structure of the blast plate is not only simple, but also the blasting strength and the blasting time are accurate and controllable.
Drawings
FIG. 1 is a schematic diagram of a "two-stage" gas generator having a combination of components known in the art.
FIG. 2 is an X-axis cross-sectional view of another "two-stage" gas generator known in the art.
FIG. 3 is a cross-sectional view in the X-axis direction of a "two-stage" gas generator of the present invention.
FIG. 4 is a schematic diagram of an embodiment of the filtration system of the present invention, wherein (a) is a perspective view of the filtration system, and (b) to (d) are dimension identification diagrams of the support ring, the annular filter screen, and the lower housing, respectively.
FIG. 5 is a schematic view of an embodiment of an annular serrated support ring used in the filtration system of the present invention.
Fig. 6 is a cross-sectional view in the X-axis direction of another "two-stage" gas generator different from that of fig. 3.
FIG. 7 is a schematic view of another embodiment of the filtration system different from that of FIG. 4, wherein (a) is a perspective view of the filtration system, and (b) to (c) are dimension indicators of the lower housing and the annular filter screen, respectively.
Fig. 8 is a schematic view of an embodiment of a lower housing employed in another filtration system different from that of fig. 4, wherein (a) is a perspective view of the lower housing and (b) is a partially enlarged schematic view.
FIG. 9 is a cross-sectional view taken along the X-axis of a second combustion chamber in accordance with the present invention.
Fig. 10 is a schematic view of an embodiment of the blast plate of the present invention, wherein (a) is a perspective view of the blast plate and (b) to (c) are size indication diagrams.
FIG. 11 is a schematic view showing the operation of the second combustion chamber of the present invention, wherein (a) is before operation and (b) is after operation.
Fig. 12 is a cross-sectional view in the X-axis direction of another second combustion chamber different from fig. 9.
Fig. 13 is a schematic view of another embodiment of the rupture disk different from that of fig. 10, wherein (a) is a perspective view of the rupture disk, (b) is a size indicator view of the rupture disk, and (c) is a size indicator view of the ignition housing.
Fig. 14 is a schematic view showing the operation of another second combustion chamber different from fig. 11, (a) before operation and (b) after operation.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1
In the gas generator of fig. 3, the upper case 10 and the lower case 20 form a housing chamber 00 after the overlapping connection sections are welded.
The circumferential wall 10a of the upper case 10 has a plurality of exhaust holes 10b, and the exhaust holes 10b are sealed by adhesion from the inner circumferential wall 10c using a sealing foil 70 made of aluminum, copper, stainless steel, or the like.
The first combustion chamber 30 and the second combustion chamber 40 are disposed in the accommodating chamber 00, wherein the first combustion chamber 30 comprises a filter system 310 with a passage, a first ignition system 320 and a first gas generating agent 330 filled in the cavity between the first ignition system 320 and the second combustion chamber 40 and the upper shell 10 and the filter system 310; the second combustion chamber 40 includes a second ignition system 420, and a second gas generating agent 430 filled inside the second ignition system 420; the first ignition system 320 and the second ignition system 420 are fixed to the flat closed end surface 20a of the lower case 20 by welding or the like at a certain distance.
As shown in fig. 4(a) - (d), the channeled filter system 310 includes an annular serrated support ring 50 disposed on the lower housing 20 and an annular filter screen 60 disposed on the annular serrated support ring. Wherein, the lower shell 20 is cup-shaped or barrel-shaped, and has a plane closed end 20a and a vertical open end 20 b; the outer circumferential surface 60c of the annular filter screen 60 has a right-angled end 60a and a rounded end 60 b.
As shown in FIG. 5, the annular serrated support ring 50 is stepped having a first horizontal step 50a, a second horizontal step 50b, and a vertical wall 50c, wherein the vertical wall 50c is disposed at a right angle 50f to both the first horizontal step 50a and the second horizontal step 50 b.
As also shown in fig. 4(a) - (D), the first horizontal step 50a of the annular serrated support ring 50 is placed on the plane of the vertical open end 20b of the lower casing 20 and has an outer diameter D1 equal to the outer diameter D2 of the vertical open end 20b of the lower casing 20; second horizontal step 50b is positioned toward planar closed end 20a of lower housing 20 and has an outer diameter D3 equal to inner diameter D1 of vertical open end 20b of lower housing 20; the length L1 of the vertical wall 50c is less than or equal to the length L2 of the vertical open end 20b of the lower housing 20, and the length L1 is adjustable according to the charge amount of the first gas generant 330; the annular serrated support ring 50 has a plurality of serrations 50d, and adjacent two serrations 50d are spaced apart to form notches 50 e. Meanwhile, the right-angled end 60a of the annular filter screen 60 abuts against the right-angled portion 50f of the second horizontal step 50b of the annular serrated support ring 50 and the vertical wall 50c, and the rounded end 60b abuts against the top inner wall 10D of the upper housing 10, and the outer diameter D4 thereof is equal to the inner diameter D2 of the second horizontal step 50b of the annular serrated support ring 50. At this time, a plurality of strip gaps 110 are formed between the annular saw-toothed supporting ring notch 50e and the outer circumferential surface 60c and the inner circumferential wall 60d of the lower housing of the annular filter screen 60.
The working principle of the gas generator shown in fig. 3 is explained next.
The height of the annular serrated support ring and the height of the annular filter screen are adjusted according to the dosage of the first gas generating agent, at the moment, part of the space of the lower shell is saved, the dosage of the first gas generating agent can be increased, the weight and the volume of the annular filter screen are reduced, and meanwhile, the filtering effect and the effect of the annular filter screen facing the exhaust hole of the upper shell are also guaranteed.
When the gas generating device works, the first gas generating agent or/and the second gas generating agent are combusted to generate a large amount of high-temperature high-pressure gas, the high-temperature gas flow firstly passes through the annular filter screen under the action of high pressure and then enters strip-shaped gaps formed between the notches of the annular serrated support ring and the outer circumferential surface of the annular filter screen and the inner circumferential wall of the lower shell, and most of solid residues in the high-temperature gas flow are adsorbed on the annular filter screen and the inner circumferential wall surface of the opening end of the lower shell. At the moment, the strip-shaped gap increases a channel and a space for gas to flow, and the effect of reducing the internal pressure of the accommodating cavity is achieved; meanwhile, when the gas passes through the strip-shaped gaps, the solid residues are further adsorbed, the gas temperature is further reduced, and the discharge amount of the solid residues and the temperature of discharged gas are reduced.
Example 2
Further, another "two stage" gas generator of the present invention can be explained with reference to FIGS. 6 to 8. This scheme is further optimized in the structure of embodiment 1, as shown in fig. 6.
The same as in embodiment 1 is: the upper shell 10 and the lower shell 20 form an accommodating cavity 00 after the overlapped connecting sections are welded; the circumferential wall 10a of the upper case 10 is provided with a plurality of exhaust holes 10b, and the exhaust holes 10b are sealed by adhering a sealing foil 70 made of aluminum, copper, stainless steel, or the like from the inner circumferential wall 10 c; the housing chamber 00 comprises a first combustion chamber 30 and a second combustion chamber 40, wherein the first combustion chamber 30 comprises a filter system 310 with a channel, a first ignition system 320 and a first gas generating agent 330 filled inside; the second combustion chamber 40 includes a second ignition system 420, and a second gas generating agent 430 filled therein; the first ignition system 320 and the second ignition system 420 are fixed to the flat closed end surface 20a of the lower case 20 by welding or the like at a certain distance.
The difference from embodiment 1 is: as shown in fig. 7(a) - (c), the channeled filter system 310 includes an annular filter screen 60 disposed on the lower housing 20. Wherein, the outer circumference 60c of the annular filter screen 60 has a right-angled end 60a and a rounded end 60 b.
As shown in fig. 8, the lower housing 20 is cylindrical and has a flat closed end 20a and a vertical open end 20b, 2 or more than 2 uniformly distributed sawtooth steps 20d and a groove 20e with the same width as the steps are formed on an inner annular surface 20c of the vertical open end 20b through stamping, cold/warm extrusion or other processes, the sawtooth steps 20d are rectangular and have a first straight side 20e1 and a second straight side 20e2 which are opposite, a third straight side 20e3 and a fourth straight side 20e4 which are opposite, and the length L1 of the sawtooth steps 20d from the vertical open end surface 20b of the lower housing is less than or equal to the length L2 of the vertical open end 20b of the lower housing 20.
As shown in fig. 7(a) - (c), the right-angled end 60a of the outer circumference 60c of the annular filter screen 60 abuts against the plane of the saw-toothed step 20e on the lower casing 20, and the rounded end 60b abuts against the inner wall 10D at the top end of the upper casing 10, and the outer diameter D4 is equal to the inner diameter D1 of the vertical opening end surface 20b of the lower casing 20. At this time, a plurality of bar-shaped gaps 110 are formed between the stepped saw teeth 20d of the lower housing 20, the groove 20e, and the outer circumferential surface 60c of the ring filter 60.
The working principle of the gas generator shown in fig. 6 is explained next.
The height of the sawtooth step and the height of the annular filter screen on the lower shell are adjusted according to the dosage of the first gas generating agent, at the moment, partial space of the lower shell is saved, the dosage of the first gas generating agent can be increased, the weight and the volume of the annular filter screen are reduced, and meanwhile, the filtering effect and the effect of the annular filter screen facing the exhaust hole of the upper shell are guaranteed.
When the gas generating device works, the first gas generating agent or/and the second gas generating agent are combusted to generate a large amount of high-temperature high-pressure gas, the high-temperature gas flow firstly passes through the annular filter screen under the action of high pressure and then enters strip-shaped gaps formed between the sawtooth steps and the grooves on the inner circumference of the lower shell and the outer circumferential surface of the annular filter screen, and most of solid residues in the high-temperature gas flow are adsorbed on the annular filter screen and the inner circumferential wall surface of the opening end of the lower shell. At the moment, the strip-shaped gap increases a channel and a space for gas to flow, and the effect of reducing the internal pressure of the accommodating cavity is achieved; meanwhile, when the gas passes through the strip-shaped gaps, the solid residues are further adsorbed, the gas temperature is further reduced, and the discharge amount of the solid residues and the temperature of discharged gas are reduced.
Example 3
On the basis of the above-described embodiments 1, 2, the second combustion chamber can be implemented as in the prior art, and can also be optimized as given with reference to fig. 9 to 11.
As shown in fig. 9, the second combustion chamber 40 includes a second ignition system 420, and a second gas generating agent 430 filled in the interior of the second ignition system 420. The second ignition system 420 includes an igniter 80, an ignition housing 90, and a rupture plate 100. Wherein the igniter 80 is positioned at one end 90a of the ignition housing 90 and the rupture disc 100 is positioned at the other end 90b of the ignition housing 90, the rupture disc 100 being secured to the end 90b of the ignition housing 90 by laser, resistance, or other welding means.
As shown in fig. 10, the rupture disc 100 is a disc shape, the middle part 100a of the disc shape protrudes to form a circular arch shape, and the edge of the circular arch shape is connected with a circular ring; the dome direction is opposite to the igniter 80 direction, the thickness delta 1 of the dome-shaped center position 100a is smaller than the thickness delta 2 of the disc-shaped circumferential position 100b, and the outer diameter D5 of the ring is equal to the outer diameter D6 of the ignition housing. In practice, the center thickness δ 1 and the dome radius R1 may be adjusted according to the set burst pressure of the second combustion chamber 40, and the dome shape of the burst plate may be cold-stamped and preformed, but is not limited to this manner of forming.
The working principle of the second combustion chamber as shown in fig. 11 will be explained next.
It should be noted that the following may occur in the first ignition system and the second ignition system according to the difference of the collision degree: only the first ignition system is started, the second ignition system is started in a delayed mode after the first ignition system is started, and the first ignition system and the second ignition system are started simultaneously. Next, a case where the second ignition system is started with a delay after the first ignition system is started will be described.
When the ignition device works, the first igniter ignites to ignite ignition powder in the first ignition system to generate certain hot particles or hot gas, the hot particles or the hot gas are discharged through an ignition hole in the ignition shell and enter the first combustion chamber to ignite the first gas generating agent in the first combustion chamber to generate a large amount of gas and heat. At this time, since the rupture plate and the second combustion chamber are fixed and sealed by welding, the first combustion chamber and the second combustion chamber are not communicated, ensuring that the second gas generant located in the second combustion chamber will not be ignited. Then, the second igniter is ignited to ignite the second gas generating agent in the second combustion chamber, more gas and heat are generated, so that the pressure in the second combustion chamber is increased sharply, when the pressure value is increased to a preset designed blasting value of the blasting plate, the arch-shaped central position of the blasting plate is torn, and the gas flows out rapidly, passes through the annular filter screen and is exhausted through the exhaust hole of the upper shell. Since the explosion value of the explosion plate is designed according to the output performance requirement of the second combustion chamber in advance, and the material and the radius and the thickness of the preformed circular arch are obtained through calculation, the explosion value and the explosion time of the explosion plate are more accurate and reliable, the output performance of the second combustion chamber is more stable, and the calculation involved is the existing calculation method and is not described too much here.
Example 4
Another second combustion chamber of the present invention can be explained with reference to FIGS. 12 to 14.
Further optimization was made on the structure of example 3, a second combustion chamber embodiment as shown in fig. 12.
The same as in example 3 is: the second combustion chamber 40 includes a second ignition system 420, and a second gas generant 430 filled therein. The second ignition system 420 includes an igniter 80, an ignition housing 90, and a rupture plate 100. Wherein the igniter 80 is positioned at one end 90a of the ignition housing 90 and the rupture disc 100 is positioned at the other end 90b of the ignition housing 90, the rupture disc 100 being secured to the end 90b of the ignition housing 90 by laser, resistance, or other welding means.
In contrast to embodiment 3: as shown in fig. 13 and 12, the rupture disc 100 has a cup shape with a closed end 100c and an open end 100 b; the middle part 100a of the closed end is in a circular arch shape, the closed end 100c is arranged towards the igniter 80, the direction of the circular arch 100a is opposite to the direction of the igniter 80, and the thickness delta 1 of the center position 100a of the arch shape is smaller than the thickness delta 2 of the circumference position 100 b; 16 communicating holes 100e are arranged on the circumferential wall 100d of the opening end 100b, a layer of sealing foil 100g is adhered on the inner surface 100f of the circumferential wall to seal the communicating holes 100e, and the material of the sealing foil 100g can be stainless steel or carbon steel, but is not limited to the above materials; the open end 100b is oriented opposite the igniter 80, and the peripheral wall 100D has an outer diameter D7 equal to or less than the inner diameter D2 of the ignition housing 90 and a circumferential position diameter D5 equal to the outer diameter D6 of the ignition housing. In practice, the dome-like thickness δ 1, the radius R1, the diameter of the communication hole and the thickness of the sealing foil may all be adjusted and designed according to the set burst pressure of the second combustion chamber 40, and the dome-like shape of the burst plate may be cold-stamped and preformed, but is not limited to this forming method.
The working principle of the second combustion chamber shown in fig. 14 will be explained next.
It should be noted that the following may occur in the first ignition system and the second ignition system according to the difference of the collision degree: only the first ignition system is started, the second ignition system is started in a delayed mode after the first ignition system is started, and the first ignition system and the second ignition system are started simultaneously. Next, a case where the second ignition system is started with a delay after the first ignition system is started will be described.
When the ignition device works, the first igniter ignites to ignite ignition powder in the first ignition system to generate certain hot particles or hot gas, the hot particles or the hot gas are discharged through an ignition hole in the ignition shell and enter the first combustion chamber to ignite the first gas generating agent in the first combustion chamber to generate a large amount of gas and heat. At this time, because the bursting plate and the second combustion chamber are fixed by welding and sealed by the sealing foil, the material and thickness of the sealing foil ensure that the second combustion chamber can not be ignited by a large amount of gas and heat generated by the first gas generating agent, so that the first combustion chamber is not communicated with the second combustion chamber, and the second gas generating agent in the second combustion chamber can not be ignited. The second igniter is then detonated to directly ignite the second gas generant located in the second combustion chamber, generating more gas and heat, causing a sharp rise in pressure within the second combustion chamber. At the moment, on one hand, the circular arch shape in the middle of the closed end of the blasting plate is rapidly stretched and deformed in the direction away from the igniter under the action of gas pressure, the open end of the blasting plate in situ in the second combustion chamber is reversely pulled out to be in a long circular arch shape, and a part of gas flow rapidly flows out through the communicating holes in the circumferential wall of the open end, passes through the annular filter screen and is discharged through the exhaust hole of the upper shell; on the other hand, the sealing foil adhered on the inner surface of the circumferential wall of the opening end of the blasting plate deforms until the sealing foil is broken under the action of gas pressure, and a part of gas flow rapidly flows out through the breaking hole, passes through the annular filter screen and is discharged through the vent hole of the upper shell. The blasting value of the blasting plate is designed according to the output performance requirement of the second combustion chamber in advance, and the material, the radius and the thickness of the preformed circular arch are obtained through calculation, so that the blasting value and the blasting time of the blasting plate are more accurate and reliable; meanwhile, the material and the thickness of the sealing foil stuck on the communication hole on the blasting plate are obtained by calculation according to the preset blasting value of the blasting plate, so that the reliability of the blasting value and the blasting time of the blasting plate is further improved, and the output performance of the second combustion chamber is more stable and reliable.
The invention has not been described in detail in part of the common general knowledge of those skilled in the art.
Claims (14)
1. A two-stage gas generator, comprising: comprises a first combustion chamber and a second combustion chamber which are not communicated with each other; the two combustion chambers are arranged in an accommodating cavity formed by the upper shell and the lower shell; the upper shell is provided with an exhaust hole;
the second combustion chamber comprises a second ignition system and a second gas generating agent filled in the second ignition system; the first combustion chamber comprises a filtering system, a first ignition system and a first gas generating agent; the filtering system comprises a filter screen and a supporting device; two ends of the filter screen are abutted between the upper shell and the supporting device on the lower shell;
the first ignition system and the second ignition system are arranged on the lower shell and are arranged in a cavity formed between the filtering system and the lower shell; the first gas generating agent is filled in a cavity between the first ignition system and the second combustion chamber and between the upper shell and the filtering system;
the second gas generant is ignited by ignition of the second ignition system;
the support device includes a second horizontal step for supporting the filter screen, and the first gas generant includes a portion higher than the second horizontal step.
2. The gas generator of claim 1, wherein: the supporting device is a supporting ring, and the supporting ring comprises a circular plane and a plurality of clamping jaws arranged on the circular plane; the circular plane is used as a second horizontal step, and two ends of the filter screen are abutted between the second horizontal step and the upper shell; the clamping jaw comprises a first horizontal step and a vertical wall; the vertical wall is arranged at a right angle with the first horizontal step and the second horizontal step; the first horizontal step is arranged on the end face of the vertical opening of the lower shell, the length of the vertical wall is adjusted according to the charging amount of the first gas generating agent, and the vertical wall is in contact with the inner wall of the lower shell.
3. The gas generator of claim 2, wherein: the at least two jack catchs and along the horizontal ladder equipartition of second, form strip clearance between the vertical wall of jack catch and the filter screen outer wall.
4. The gas generator of claim 1, wherein: the supporting device is a step protruding from the inner wall of the lower shell, the height of the step is designed according to the charging amount of the first gas generating agent, and the step and the lower shell are integrally designed.
5. The gas generator of claim 4, wherein: the lower shell is cylindrical and is provided with a plane closed end and a vertical open end, the step is arranged on the inner annular surface of the vertical open end, and a groove with the same width as the step is formed between the step position and the vertical open end.
6. The gas generator according to claim 4 or 5, characterized in that: the step is formed by stamping and cold/warm extrusion.
7. The gas generator of claim 5, wherein: the filter screen is characterized in that at least two steps are uniformly distributed along the circumference of the inner wall of the lower shell, and strip-shaped gaps are formed among the steps, the grooves and the outer wall of the filter screen.
8. The gas generator according to claim 1 or 4, characterized in that: the filter screen is an annular filter screen; the outer periphery of filter screen has right angle end and fillet end, the right angle end supports and leans on support ring or step plane, the fillet end with go up casing top inner wall butt.
9. The gas generator according to claim 1 or 4, characterized in that: the second ignition system comprises an igniter, an ignition shell and a blast plate for establishing gas pressure and a gas flow channel;
the igniter is located at one end of the ignition shell, the explosion plate is located at the other end of the ignition shell, and the explosion plate is fixed at the end part of the ignition shell.
10. The gas generator of claim 9, wherein: the shape of the explosion plate consists of a circular arch with a convex middle part and a circular ring connected with the edge of the circular arch; the thickness of the center of the circular arch is the minimum, the outer diameter of the circular ring is equal to or smaller than the outer diameter of the ignition shell, and the direction of the circular arch is opposite to the direction of the igniter.
11. The gas generator of claim 9, wherein: the explosion plate is barrel-shaped and is provided with a closed end and an open end which is flanged outwards;
the middle part of the closed end is in a circular arch shape, the closed end faces the direction of the igniter, and the direction of the circular arch is opposite to the direction of the igniter;
the direction of the opening end is opposite to the direction of the igniter, the maximum diameter of the opening end is equal to or less than the outer diameter of the ignition shell, a plurality of communicating holes are arranged on the circumferential wall of the opening end, sealing foils are stuck on the surface of the circumferential wall, and the outer diameter of the circumferential wall is equal to or less than the inner diameter of the ignition shell.
12. The gas generator of claim 11, wherein: the sealing foil is made of stainless steel, copper or aluminum.
13. The gas generator according to claim 3 or 7, characterized in that: the number of the strip-shaped gaps is selected within the range of 6-20.
14. The gas generator of claim 13, wherein: the number of the strip-shaped gaps is selected within the range of 10-16.
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| CN201910273062.2A CN109927664B (en) | 2019-04-04 | 2019-04-04 | Two-stage gas generator |
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| JP7343354B2 (en) * | 2019-10-16 | 2023-09-12 | 株式会社ダイセル | Gas generator and how to assemble the gas generator |
| CN111548242B (en) * | 2020-05-15 | 2021-09-03 | 湖北航鹏化学动力科技有限责任公司 | Gas generator |
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| EP1053916B1 (en) * | 1999-02-16 | 2004-05-26 | Daicel Chemical Industries, Ltd. | Gas generator for multi-stage air bag and air bag device |
| US7044502B2 (en) * | 2004-02-24 | 2006-05-16 | Key Safety Systems, Inc. | Dual stage pyrotechnic driver inflator |
| JP4970813B2 (en) * | 2006-03-22 | 2012-07-11 | 株式会社ダイセル | Gas generator for vehicle restraint system |
| JP5101923B2 (en) * | 2007-04-18 | 2012-12-19 | 株式会社ダイセル | Gas generator for restraining vehicle personnel |
| FR2922007A1 (en) * | 2007-10-03 | 2009-04-10 | Livbag Soc Par Actions Simplif | PYROTECHNIC GAS GENERATOR FOR AUTOMOBILE SAFETY, DISCOIDED |
| JP5922956B2 (en) * | 2012-03-12 | 2016-05-24 | 株式会社ダイセル | Gas generator |
| US8556294B1 (en) * | 2012-08-22 | 2013-10-15 | Key Safety Systems, Inc | Airbag inflator |
| JP6313031B2 (en) * | 2013-02-22 | 2018-04-18 | 株式会社ダイセル | Gas generator |
| JP6749788B2 (en) * | 2016-05-18 | 2020-09-02 | 株式会社ダイセル | Gas generator |
| CN109353304B (en) * | 2018-11-06 | 2024-04-23 | 延锋汽车智能安全***有限责任公司 | Gas generator and inflatable safety device |
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