CN109927664A - A kind of twin-stage type gas generator - Google Patents
A kind of twin-stage type gas generator Download PDFInfo
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- CN109927664A CN109927664A CN201910273062.2A CN201910273062A CN109927664A CN 109927664 A CN109927664 A CN 109927664A CN 201910273062 A CN201910273062 A CN 201910273062A CN 109927664 A CN109927664 A CN 109927664A
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Abstract
A kind of twin-stage type gas generator, including mutually disconnected the first combustion chamber and the second combustion chamber；Above-mentioned two combustion chamber is arranged in the accommodating cavity formed by upper housing and lower case；Gas vent is set on the upper housing；Second combustion chamber includes the second ignition system, and is filled in the second gas propellant of the second igniting internal system；First combustion chamber includes filtration system, the first ignition system and first gas propellant；The filtration system includes filter screen and support device；The filter screen both ends are resisted against between the support device on upper housing and lower case；First ignition system and the second ignition system are mounted in the lower case and are placed in the cavity by being formed between filtration system and lower case；First gas propellant is filled in the cavity between first ignition system, the second combustion chamber and upper housing, filtration system.
Description
Technical field
The present invention relates to the gas generators that the restraint device of vehicle etc. uses, more particularly to one or more combustions
The gas generator for burning room more particularly relates to " stage type " gas generator with 2 grades of combustion chambers.
Background technique
The restraint device of vehicle etc. generates gas usually using gas generator, and substitute is constrained when for colliding
The inflation of capsule.Situation is complicated when due to vehicle collision, and " stage type " gas generator with 2 grades of combustion chambers can be according to collision
Intensity, speed etc. selectively change output performance parameter, more advantageous.But meanwhile because use with performance needs, it is this
Gas generator have more complicated structure and biggish weight, which adds the complexity of design, additional part with
And associated manufacturing cost.
In CN106660510A, a kind of gas generator structure with 2 combustion chambers is described, combustion chamber has
A kind of glass of component and barrel member combination.Fig. 1 (a) is cup component, and cup component has anticreep building slit 136, connection slit and leads
Enter slit.Fig. 1 (b) is barrel member, and barrel member 141 has outwardly projecting 2 protrusions 142 in the radial direction.When assembly, cup
The protrusion 142 that component need to will import slit and barrel member could be pressed after being aligned, after along connect slit rotate counterclockwise to it is anti-
De- building slit 136, further along axis downwards until protrusion 142 resists 136 one end of anticreep building slit and stops；When work, cup component
It is moved up along 136 direction of anticreep building slit, until protrusion 142 is abutted with the other end of anticreep building slit 136, cup component
Through hole exposes.Such design, not only structure is complicated for combustion chamber, simultaneously as cup member position can not be fixed, there is also shakes
There is the defect moved along the axial and circumferential directions in dynamic situation, may bring glass component can not be according to the hidden danger of design work.
In CN105644491B, a kind of secondary delay ignition inflatable gas generator structure is described.Such as Fig. 2 institute
Show, the two sides of upper housing 2 are respectively equipped with filter 16, and 1 bottom of lower case is equipped with filter gasket 17, and upper housing bottom, which is equipped with, to be used
In the elastomeric pad 18 of filter support, the lateral surface of elastomeric pad is bonded with the bottom surface of upper housing.At this point, filter passes through end
Face abuts bottom surface and filter gasket and the axial restraint of upper housing respectively, but the filter height of such structure design is higher,
The weight of gas generator is increased indirectly.
Summary of the invention
Technology of the invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of twin-stage type gas generator.
The technical solution of the invention is as follows: a kind of twin-stage type gas generator, including mutually disconnected first combustion chamber
With the second combustion chamber；Above-mentioned two combustion chamber is arranged in the accommodating cavity formed by upper housing and lower case；The upper housing
Upper setting gas vent；
Second combustion chamber includes the second ignition system, and is filled in the second gas hair of the second igniting internal system
Raw agent；First combustion chamber includes filtration system, the first ignition system and first gas propellant；The filtering system
System includes filter screen and support device；The filter screen both ends be resisted against the support device in upper housing and lower case it
Between；
First ignition system and the second ignition system are mounted in the lower case and are placed in by filtration system and lower casing
In the cavity formed between body；First gas propellant is filled in first ignition system, the second combustion chamber and upper housing, mistake
In cavity between filter system.
Preferably, the support device is support ring, and the support ring includes an annular plane and setting
Multiple claws in the annular plane；The annular plane as the second horizontal steps, filter screen both ends against
Between the second horizontal steps and upper housing；The claw includes first level ladder and vertical wall；The vertical wall and institute
State first level ladder, second horizontal steps are at right angles arranged；First level ladder is placed in lower case vertical opening end
On face, vertical wall length is adjusted according to the explosive payload of first gas propellant, and vertical wall is contacted with lower case inner wall.
Preferably, the claw at least two and uniformly distributed along the second horizontal steps, outside the vertical wall and filter screen of claw
Strip gap is formed between wall.
Preferably, the support device is the step of lower case inner wall protrusion, and the height of step is sent out according to first gas
Raw agent explosive payload is designed, and the step and lower case are integrally designed.
Preferably, the lower case is barrel-shaped, has plane closed end and vertical opening end, the step setting
On the inner ring surface at vertical opening end and stepped locations are to being arranged identical with step width groove between vertical opening end.
Preferably, the forming mode of the step is punching press, cold/warm extrusion technology.
Preferably, the step at least two and along lower case inner wall circumference uniform distribution, the step, groove and filtering
Strip gap is formed between net outer wall.
Preferably, the filter screen is circular filter net；The outer circumference surface of filter screen has right angle end and rounded end, institute
Right angle end is stated in support ring or step plane, the rounded end is abutted with upper housing top inner wall.
Preferably, second ignition system includes igniter, the shell and to establish gas pressure and air-flow logical of lighting a fire
The explosion plate in road；
The igniter is located at one end of the igniting shell, and the explosion plate is located at the other end of the igniting shell,
The explosion plate is fixed on the igniting shell end.
Preferably, the explosion plate shape is by the circular arch shape of middle part protrusion and the annulus with the circular arch shape side edge
Composition；Circular arch shape center thickness is minimum, and annulus outer diameter is equal to or less than the outer diameter of the igniting shell, the circular arch
Direction is opposite with the igniter direction.
Preferably, the explosion plate is in tubbiness, the open end with closed end and outward flanging；
It is in circular arch shape in the middle part of the closed end, the closed end is towards the igniter direction, the circular arch direction and institute
It is opposite to state igniter direction；
The opening extreme direction is opposite with the igniter direction, and the open end maximum gauge is equal to or less than the point
The outer diameter of fiery shell, has multiple intercommunicating pores, circumferential wall surface adhesive seal foil in the circumferential wall of open end, and circumferential wall outer diameter is equal to
Or it is less than the igniting housing inner diameter.
Preferably, the sealing foil material is stainless steel, copper or aluminium.
Preferably, the strip number of gaps selection range 6~20.
Preferably, the strip number of gaps selection range is 10~16.
The present invention has the beneficial effect that compared with prior art
(1) gas generator structure provided by the invention is simpler, and number of parts is less, and gas-forming agent explosive payload can machine
It is dynamic to adjust, and the first combustion chamber is not interfere with each other with the second combustion chamber, performance is more stable, reliable.
(2) present invention, only need to be by simply adjusting annular zigzag branch in the case where not changing gas generator volume
Pushing out ring height or lower case serrated step position height, to adjust the height of circular filter net, so that it may adjust the first combustion chamber
Charge space volume.Not only ensure that circular filter net be located at upper housing exhaust hole site fillter section sufficiently use, reduce
Filter screen length, and then mitigate the weight of entire gas generator, also save a part of lower case space for adjust first
The explosive payload of gas-forming agent achievees the purpose that adjust " the 1st grade " combustion chamber output performance.
(3) filtration system of the present invention not only can reduce gas temperature, and several of its formation with adsorbent solid residue
Shape gap also adds the channel and space of gas flowing, and then plays the role of reducing combustion chamber pressure.Therefore, it is protecting
Under the premise of demonstrate,proving gas generator safety coefficient, in the case where same explosive payload, identical output performance, gas generator can make
With the case material that thinner, mechanical performance is lower, price is less expensive, and then mitigate the weight of entire gas generator, drop
Low design and purchase cost.
(4) the second combustion chamber output pressure of the invention, time control are more accurate, more reliable.According to the requirement of output performance,
Suitable material need to be only selected, the radius and plate thickness of explosion plate preform circular arch is adjusted, can accurately calculate explosion plate explosion
Intensity, when work, as long as the second indoor pressure of burning rises to preset explosion plate burst strength, explosion plate occurs broken
It splits.The structure of explosion plate is not only simple, but also burst strength and blasting time are all precisely controllable.
Detailed description of the invention
Fig. 1 is components combination diagram possessed by a kind of " stage type " gas generator known in the art.
Fig. 2 is the X-direction sectional view of another " stage type " gas generator known in the art.
Fig. 3 is the sectional view of the X-direction of one kind " stage type " gas generator of the invention.
Fig. 4 is the schematic diagram of filtration system embodiment of the invention, wherein (a) is filtration system perspective view, (b)~
It (d) is respectively support ring, circular filter net, lower case sizing figure.
Fig. 5 is the schematic diagram for the band saw dentation support ring embodiment that filtration system of the invention uses.
Fig. 6 is the sectional view of the X-direction of another kind " stage type " gas generator different from Fig. 3.
Fig. 7 is the schematic diagram of another filtration system embodiment different from Fig. 4, wherein (a) is that filtration system is three-dimensional
Figure, (b)~(c) is respectively lower case, circular filter net sizing figure.
Fig. 8 is the schematic diagram for the lower case embodiment that another filtration system different from Fig. 4 uses, wherein (a) is
Lower case perspective view (b) is partial enlargement diagram.
Fig. 9 is the sectional view of the X-direction of the second combustion chamber of one kind of the invention.
Figure 10 is the schematic diagram of explosion plate embodiment of the invention, wherein (a) is explosion plate perspective view, (b)~(c) is
Sizing figure.
Figure 11 is the operation schematic diagram of the second combustion chamber of the invention, before (a) is work, (b) for after work.
Figure 12 is the sectional view of the X-direction of another kind second combustion chamber different from Fig. 9.
Figure 13 is the schematic diagram of another explosion plate embodiment different from Figure 10, wherein (a) is explosion plate perspective view,
(b) it is explosion board size mark figure, is (c) igniting shell dimension mark figure.
Figure 14 be another kind second combustion chamber different from Figure 11 operation schematic diagram, (a) be work before, (b) be work
Afterwards.
Specific embodiment
With reference to the accompanying drawing and example elaborates to the present invention.
Embodiment 1
In the gas generator of Fig. 3, upper housing 10 and lower case 20 form an accommodating after being overlapped linkage section welding
Chamber 00.
There is several gas vent 10b, gas vent 10b to use the sealing such as aluminium, copper, stainless steel on 10 circumferential wall 10a of upper housing
Foil 70 carries out adhesive seal from inner peripheral wall 10c.
First combustion chamber 30 and the second combustion chamber 40 are arranged in accommodating cavity 00, wherein the first combustion chamber 30 includes tape channel
Filtration system 310, the first ignition system 320 and be filled in the first ignition system 320, the second combustion chamber 40 and upper housing
10, the first gas propellant 330 in the cavity between filtration system 310；Second combustion chamber 40 includes the second ignition system
420, and it is filled in the second gas propellant 430 inside the second ignition system 420；First ignition system 320 and second point
Fiery system 420 is fixed on the plane closed end 20a of lower case 20 by modes such as welding, and separated by a distance.
As shown in Fig. 4 (a)-(d), the filtration system 310 of tape channel includes the band saw dentation branch being placed in lower case 20
Pushing out ring 50 and the circular filter net 60 being placed in band saw dentation support ring.Wherein, lower case 20 is cup-shaped or becomes bucket
Shape has plane closed end 20a and vertical opening end 20b；The outer circumference surface 60c of circular filter net 60 have right angle end 60a and
Rounded end 60b.
As shown in figure 5, band saw dentation support ring 50 is stepped, there is first level ladder 50a, the second horizontal steps
50b and vertical wall 50c, wherein vertical wall 50c and the rectangular 50f of first level ladder 50a, the second horizontal steps 50b are arranged.
For another example shown in Fig. 4 (a)-(d), the first level ladder 50a of band saw dentation support ring 50 is placed in lower case 20
In the plane of vertical opening end 20b, outer diameter D 1 is equal to the outer diameter D 2 of 20 vertical opening end 20b of lower case；Second horizontal steps
The plane closed end 20a of 50b towards lower case 20 is placed, and outer diameter D 3 is equal to the internal diameter d1 of 20 vertical opening end 20b of lower case；
The length L1 of vertical wall 50c is less than or equal to the length L2 of 20 vertical opening end 20b of lower case, and can be occurred according to first gas
The explosive payload of agent 330 carrys out adjustment length L1；Band saw dentation support ring 50 has multiple sawtooth 50d, between two neighboring sawtooth 50d
Notch 50e is formed at a certain distance.Meanwhile the right angle end 60a of circular filter net 60 is resisted against band saw dentation support ring 50
The right angle 50f of second horizontal steps 50b and vertical wall 50c, rounded end 60b are abutted with 10 top inner wall 10d of upper housing, outside
Diameter D4 is equal to the internal diameter d2 of 50 second horizontal steps 50b of band saw dentation support ring.At this point, band saw dentation support ring notch
Multiple strip gaps 110 are formed between 50e and the outer circumference surface 60c and lower case inner peripheral wall 60d of circular filter net 60.
Next the working principle of gas generator as shown in Figure 3 is illustrated.
The explosive payload of the height foundation first gas propellant of the height and circular filter net of band saw dentation support ring
How many to adjust, not only the segment space of lower case saves can be used for increasing the explosive payload of first gas propellant at this time,
Reduce the weight and volume of circular filter net, while also ensuring the mistake for facing the circular filter net of upper housing exhaust hole site
Filter effect and effect.
When work, first gas propellant or/and the burning of second gas propellant generate a large amount of high temperature and high pressure gas, high
Warm air first passes through circular filter net, enters back into band saw dentation support ring notch and circular filter net under high pressure effect
Outer circumference surface, in the strip gap that is formed between lower case inner peripheral wall, solid residue therein is largely adsorbed on annular
In filter screen and on the inner peripheral wall surface of lower case open end.At this point, strip gap increases the channel and space of gas flowing,
Play the role of reducing the internal pressure of accommodating cavity；Meanwhile gas pass through strip gap when, solid residue is further inhaled
Attached, gas temperature further decreases, and reduces the discharge rate of solid residue and the gas temperature of discharge.
Embodiment 2
Further, another kind of the invention " stage type " gas generator can refer to attached drawing 6~8 and explain.The party
Case is further optimized in the structure of embodiment 1, gas generator as shown in FIG. 6.
Identical with embodiment 1 to be: upper housing 10 and lower case 20 form an accommodating after being overlapped linkage section welding
Chamber 00；There is several gas vent 10b, gas vent 10b to utilize the sealing foils 70 such as aluminium, copper, stainless steel on 10 circumferential wall 10a of upper housing
Adhesive seal is carried out from inner peripheral wall 10c；Accommodating cavity 00 includes the first combustion chamber 30 and the second combustion chamber 40, wherein the first burning
Room 30 includes the filtration system 310 of tape channel, the first ignition system 320 and the first gas propellant 330 for being filled in inside；
Second combustion chamber 40 includes the second ignition system 420, and is filled in internal second gas propellant 430；First igniting system
System 320 and the second ignition system 420 are fixed on the plane closed end 20a of lower case 20 by modes such as welding, and are separated by
Certain distance.
Unlike embodiment 1: as shown in Fig. 7 (a)-(c), the filtration system 310 of tape channel includes being placed in lower casing
Circular filter net 60 on body 20.Wherein, the outer circumference surface 60c of circular filter net 60 has right angle end 60a and rounded end 60b.
As shown in figure 8, lower case 20 is cylindrical, there is plane closed end 20a and vertical opening end 20b, vertical opening
It holds and forms 2 or 2 or more uniformly distributed serrated steps by punching press or cold/Warm Extrusion or other techniques on 20b inner ring surface 20c
20d, and groove 20e identical with step width, serrated step 20d are in rectangle, with opposite the first straight flange 20e1 and the
Two straight flange 20e2, opposite third straight flange 20e3 and the 4th straight flange 20e4, serrated step 20d is apart from lower case vertical opening end face
20b length L1 is less than or equal to 20 vertical opening end 20b length L2 of lower case.
For another example shown in 7 (a)-(c), 60 right angle excircle 60c end 60a of circular filter net is resisted against the sawtooth in lower case 20
In step 20e plane, rounded end 60b is abutted with 10 top inner wall 10d of upper housing, and outer diameter D 4 is equal to 20 vertical opening of lower case
End face 20b internal diameter d1.At this point, the outer circumference surface 60c of serrated step 20d, groove 20e in lower case 20 and circular filter net 60
Between form multiple strip gaps 110.
Next the working principle of gas generator as shown in FIG. 6 is illustrated.
The explosive payload of the height foundation first gas propellant of the height and circular filter net of serrated step in lower case
How many to adjust, not only the segment space of lower case saves can be used for increasing the explosive payload of first gas propellant at this time,
Reduce the weight and volume of circular filter net, while also ensuring the mistake for facing the circular filter net of upper housing exhaust hole site
Filter effect and effect.
When work, first gas propellant or/and the burning of second gas propellant generate a large amount of high temperature and high pressure gas, high
Warm air first passes through circular filter net, enters back into serrated step, groove and ring on lower case inner periphery under high pressure effect
In the strip gap formed between the outer circumference surface of shape filter screen, solid residue therein is largely adsorbed in circular filter net
On the inner peripheral wall surface of lower case open end.At this point, strip gap increases the channel and space of gas flowing, drop is played
The low effect of the internal pressure of accommodating cavity；Meanwhile gas pass through strip gap when, solid residue is further adsorbed, gas
Temperature further decreases, and reduces the discharge rate of solid residue and the gas temperature of discharge.
Embodiment 3
On the basis of above-described embodiment 1,2, the second combustion chamber can use way of realization in the prior art, can also be with
Using such as with reference to the prioritization scheme provided in attached drawing 9~11.
As shown in figure 9, the second combustion chamber 40 includes the second ignition system 420, and it is filled in the second ignition system 420
The second gas propellant 430 in portion.Second ignition system 420 includes igniter 80, igniting shell 90 and explosion plate 100.Wherein,
Igniter 80 is located at one end 90a of igniting shell 90, and explosion plate 100 is located at the other end 90b of igniting shell 90, explosion plate 100
Igniting 90 end 90b of shell is fixed on by laser welding, electric resistance welding or other welding manners.
As shown in Figure 10, for explosion plate 100 in dish, dish middle part 100a protrusion is in circular arch shape, circular arch shape edge and annulus
Connect；Circular arch direction is oppositely arranged with 80 direction of igniter, and circular arch shape center 100a thickness δ 1 is less than dish-shaped circumferential position
100b thickness δ 2, annulus outer diameter D 5 are equal to the outer diameter D 6 of igniting shell.In practice, center thickness δ 1 and circular arch shape radius R1
Can according to the burst pressure adjusted design of the second combustion chamber 40 of setting, the circular arch shape of explosion plate can cold stamping preform, but not
It is confined to the forming mode.
Next the working principle of the second combustion chamber as shown in figure 11 is illustrated.
It should be noted that according to the difference of impact severity following feelings can occur for the first ignition system and the second ignition system
Condition: the starting of only the first ignition system, the second igniting system delay starting and the first igniting system after the starting of the first ignition system
System and the second ignition system start simultaneously.Below with regard to the first ignition system starting after second igniting system delay starting the case where into
Row explanation.
When work, the first igniter fire lights the ignition charge in the first ignition system, generates certain hot particle
Or hot gas, it is discharged by fire hole on igniting shell, into the first combustion chamber, the first gas being located therein of igniting occurs
Agent generates a large amount of gas and heat.At this point, be welded and fixed and seal since explosion plate passes through with the second combustion chamber, the
One combustion chamber is not connected to the second combustion chamber, guarantees that the second gas propellant being located in the second combustion chamber will not be ignited.
Then, second igniter is lighted a fire, and is lighted the second gas propellant in the second combustion chamber, is generated more gases and heat,
So that the second internal pressure of combustion chamber sharply increases, and when pressure value rises to explosion plate predetermined design explosion value, explosion plate circular arch shape
Center tearing, gas quickly flow out, and pass through circular filter net, are discharged by the gas vent of upper housing.Due to explosion plate
Explosion value be output performance requirement predetermined design according to the second combustion chamber, the radius of material and preform circular arch and
Thickness be all by being calculated, so the explosion value of explosion plate and blasting time are more accurate, reliably, the second combustion chamber it is defeated
Performance is more stable out, it is above-mentioned be related to be calculated as existing calculation method, be not described excessively herein.
Embodiment 4
The second combustion chamber of another kind of the invention can refer to attached drawing 12~14 and explain.
Further optimize in the structure of embodiment 3, the second combustion chamber embodiment as shown in figure 12.
Same as Example 3: the second combustion chamber 40 includes the second ignition system 420, and is filled in internal the
Two gas-forming agents 430.Second ignition system 420 includes igniter 80, igniting shell 90 and explosion plate 100.Wherein, igniter
80 are located at one end 90a of igniting shell 90, and explosion plate 100 is located at the other end 90b of igniting shell 90, and explosion plate 100 is by swashing
Photocoagulation, electric resistance welding or other welding manners are fixed on igniting 90 end 90b of shell.
Unlike embodiment 3: as shown in Figure 13, Figure 12, explosion plate 100 is cup-shaped, have closed end 100c and
Open end 100b；100a is in circular arch shape in the middle part of closed end, and closed end 100c is arranged towards 80 direction of igniter, the direction circular arch 100a
Opposite with 80 direction of igniter, arcuation center 100a thickness δ 1 is less than circumferential position 100b thickness δ 2；Open end 100b circle
There is 16 intercommunicating pore 100e, circumferential wall inner surface 100f to paste one layer of sealing foil 100g on peripheral wall 100d and seal intercommunicating pore
100e, sealing foil 100g material can be stainless steel, carbon steel, but be not limited to the above material；The open end direction 100b and igniting
80 direction of device is opposite, and circumferential wall 100d outer diameter D 7 is equal to or less than igniting 90 internal diameter d2 of shell, and circumferential position diameter D5 is equal to point
The outer diameter D 6 of fiery shell.In practice, circular arch shape thickness δ 1, radius R1, connection bore dia and sealing foil thickness can be according to settings
The second combustion chamber 40 burst pressure adjusted design, the circular arch shape of explosion plate can cold stamping preform, but be not limited to this at
Shape mode.
Next the working principle of the second combustion chamber as shown in figure 14 is illustrated.
It should be noted that according to the difference of impact severity following feelings can occur for the first ignition system and the second ignition system
Condition: the starting of only the first ignition system, the second igniting system delay starting and the first igniting system after the starting of the first ignition system
System and the second ignition system start simultaneously.Below with regard to the first ignition system starting after second igniting system delay starting the case where into
Row explanation.
When work, the first igniter fire lights the ignition charge in the first ignition system, generates certain hot particle
Or hot gas, it is discharged by fire hole on igniting shell, into the first combustion chamber, the first gas being located therein of igniting occurs
Agent generates a large amount of gas and heat.At this point, sealed since explosion plate and the second combustion chamber pass through to be welded and fixed with sealing foil,
The material and thickness of this sealing foil guarantee that it will not generate a large amount of gas by first gas propellant and heat is lighted, therefore the
One combustion chamber is not connected to the second combustion chamber, and the second gas propellant in the second combustion chamber will not be ignited.Then,
Second igniter detonation, directly lights the second gas propellant in the second combustion chamber, generates more gases and heat,
So that the second internal pressure of combustion chamber sharply increases.At this point, the circular arch shape in the middle part of one side explosion plate closed end is in gas pressure
It is in situ to be reversed in the second burning indoor explosion plate open end rapidly towards the direction stretcher strain for deviating from igniter under effect
Pulling out is in oval arcuation, and a part of air-flow is flowed out rapidly by the intercommunicating pore being located in the circumferential wall of open end, passes through annular filter
Net is discharged by the gas vent of upper housing；On the other hand, stickup is covered in close on the circumferential wall inner surface of explosion plate open end
Foil is sealed under the action of gas pressure, is deformed until rupture, a part of air-flow are flowed out rapidly by foramen lacerum, across annular
Filter screen, and be discharged by the gas vent of upper housing.Since the explosion value of explosion plate is the output according to the second combustion chamber
Predetermined design can be required, the radius and thickness of material and preform circular arch are all by being calculated, so explosion
The explosion value of plate and blasting time are more accurate, reliably；Meanwhile the material and thickness for the sealing foil pasted on the intercommunicating pore on explosion plate
Degree is also further to improve the explosion value of explosion plate and quick-fried by being calculated in this way according to preset explosion plate explosion value
The reliability of broken time, so that the output performance of the second combustion chamber is more stable, reliable.
Unspecified part of the present invention belongs to common sense well known to those skilled in the art.
Claims (14)
1. a kind of twin-stage type gas generator, it is characterised in that: including mutual disconnected the first combustion chamber and the second combustion chamber；On
Two combustion chambers are stated to be arranged in the accommodating cavity formed by upper housing and lower case；Gas vent is set on the upper housing；
Second combustion chamber includes the second ignition system, and is filled in the second gas generation of the second igniting internal system
Agent；First combustion chamber includes filtration system, the first ignition system and first gas propellant；The filtration system
Including filter screen and support device；The filter screen both ends are resisted against between the support device on upper housing and lower case；
First ignition system and the second ignition system be mounted in the lower case and be placed in by filtration system and lower case it
Between in the cavity that is formed；First gas propellant is filled in first ignition system, the second combustion chamber and upper housing, filtering system
In cavity between system.
2. gas generator according to claim 1, it is characterised in that: the support device is support ring, described
Support ring includes an annular plane and multiple claws for being arranged in the annular plane；The annular plane
As the second horizontal steps, filter screen both ends are resisted against between the second horizontal steps and upper housing；The claw includes first
Horizontal steps and vertical wall；The vertical wall is at right angles arranged with the first level ladder, second horizontal steps；The
One horizontal steps are placed on lower case vertical opening end face, and vertical wall length is adjusted according to the explosive payload of first gas propellant,
Vertical wall is contacted with lower case inner wall.
3. gas generator according to claim 2, it is characterised in that: the claw at least two and along the second level
Ladder is uniformly distributed, and strip gap is formed between the vertical wall and filter screen outer wall of claw.
4. gas generator according to claim 1, it is characterised in that: the support device is lower case inner wall protrusion
Step, the height of step is designed according to first gas propellant explosive payload, and the step and lower case are integrally designed.
5. gas generator according to claim 4, it is characterised in that: the lower case be it is barrel-shaped, have plane
Closed end and vertical opening end, the step is arranged on the inner ring surface at vertical opening end and stepped locations are to vertical opening end
Between identical with the step width groove of setting.
6. gas generator according to claim 4 or 5, it is characterised in that: the forming mode of the step be punching press,
Cold/warm extrusion technology.
7. gas generator according to claim 5, it is characterised in that: the step at least two and along lower case
Wall circumference uniform distribution forms strip gap between the step, groove and filter screen outer wall.
8. gas generator according to claim 1 or 4, it is characterised in that: the filter screen is circular filter net；It crosses
The outer circumference surface of strainer has right angle end and rounded end, and the right angle end is in support ring or step plane, the fillet
End is abutted with upper housing top inner wall.
9. gas generator according to claim 1 or 4, it is characterised in that: second ignition system includes igniting
Device lights a fire and shell and establishes the explosion plate of gas pressure and airflow channel；
The igniter is located at one end of the igniting shell, and the explosion plate is located at the other end of the igniting shell, described
Explosion plate is fixed on the igniting shell end.
10. gas generator according to claim 9, it is characterised in that: the explosion plate shape by middle part protrusion circle
It arcuation and is formed with the annulus of the circular arch shape side edge；Circular arch shape center thickness is minimum, annulus outer diameter etc.
In or less than the igniting shell outer diameter, the circular arch direction is opposite with the igniter direction.
11. gas generator according to claim 9, it is characterised in that: the explosion plate be in tubbiness, have closed end and
The open end of outward flanging；
It is in circular arch shape in the middle part of the closed end, the closed end is towards the igniter direction, the circular arch direction and the point
Firearm direction is opposite；
The opening extreme direction is opposite with the igniter direction, and the open end maximum gauge is equal to or less than the igniting shell
The outer diameter of body, has multiple intercommunicating pores, circumferential wall surface adhesive seal foil in the circumferential wall of open end, and circumferential wall outer diameter is equal to or small
In the igniting housing inner diameter.
12. gas generator according to claim 11, it is characterised in that: the sealing foil material be stainless steel, copper or
Aluminium.
13. gas generator according to claim 3 or 7, it is characterised in that: the strip number of gaps selection range
6~20.
14. gas generator according to claim 13, it is characterised in that: the strip number of gaps selection range is
10~16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910273062.2A CN109927664B (en) | 2019-04-04 | 2019-04-04 | Two-stage gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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