CN108466596A - Driver's supersonic speed air suction type air-cushion inflator - Google Patents
Driver's supersonic speed air suction type air-cushion inflator Download PDFInfo
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- CN108466596A CN108466596A CN201810025522.5A CN201810025522A CN108466596A CN 108466596 A CN108466596 A CN 108466596A CN 201810025522 A CN201810025522 A CN 201810025522A CN 108466596 A CN108466596 A CN 108466596A
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- Prior art keywords
- gas
- shell
- thin slice
- air bag
- channel
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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
- B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
- B60R21/203—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components in steering wheels or steering columns
-
- 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
- B60R21/30—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 with means to draw ambient air into the flow line and mix such air with the inflation fluid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Air Bags (AREA)
Abstract
Air suction type air bag gas generator includes the shell for limiting channel, which has first end region and the second end region, and leads to the inside of air bag when being connected to shell；Suction gas inlet part is connected to first end region and limits gas flow channel；And the reflux valve between gas flow channel and shell channel.Reverse flow valve selectively makes the flowing of the gas between these channels depend on the pressure difference on its opposite side.Gas generator assembly in the housing and generates gas.Gas generator assembly includes the first thin slice and the second thin slice, defines therebetween circumferential expansion area and circumferential slit, the gas of generation flows into the region by the circumferential slit, then enters shell channel at the position between reflux valve and first petiolarea.Gas generator assembly and shell are in the gas to shell channel that the exit of slit provides Supersonic Flow.
Description
Technical field
It is inhaled the present invention relates to the low cost based on Supersonic Flow of Prandtl-Meyer (Pulan Te Maier) effect is used
Gas air bag system.The invention further relates to the air suction type inflations for improving expansion characteristics and performance using Pulan Te Maier effects
Mechanism assembly.
Technological invention background
Several air suction type air bag systems are developed, including the aspirator and Kuang Daxiao for using subcritical flow
It answers.When the high pressure gas as air source pressure be less than several atmospheric pressure, selection no more than 3 or 5 atmospheric pressure compressed gas
When body is gas source, rectify fine up to effect.At a higher pressure, gas cannot follow it is expected rectify up to section, therefore cannot
Air-breathing occurs, high pressure gas will not reach inspiratory effects as expection, flow out the opening of aspirator and the outer low-voltage ring that is open
Border gas should be into air entry but into not next.In particular, if rectify up to nozzle pressure source be more than several atmospheric pressure, substantially
It cannot follow and be rectified up to wall curvature perpendicular to the source gas of aspirator axis injection, to stop sucking the air in air.This is aobvious
Limit the gas pressure that can be used with writing
On the other hand, tens of to hundreds of atmospheric pressures can be generated for the pyrotechnic gas generator of conventional security air bag
Gas pressure, and if seeking to be used together up to effect with rectifying, must throttle, can substantially waste most of gas hair
The energy of raw device gas.
In addition, when use is rectified up to effect, the pressure into air bag can be down to 1 or 2psi, and according to as described herein
Design is based on supersonic flow and Pulan Te Maier effects, can significant raising available pressure.In order to open airbag cover and gas be unfolded
Capsule needs 3 to 6psi pressure.Further, since more energy are available, Prandtl-Meyer effects lead to higher air-breathing
Than.Therefore, air suction type gas generator of the invention design solves the problems, such as that previously used rectify designs generation up to effect.
The interested prior art is included in United States Patent (USP), the patent No. 6,142,516,7,703,395,7,748,737
With 7,762,580, United States Patent (USP), issued patents No.20070284863.
Technological invention is summarized
During being related to the accident of vehicle, a kind of suction-type gas generator for air bag is deployed to vehicle and multiplies
Visitor/driver's cabin includes shell to protect the driver or passenger of vehicle, this suction producer, the shell include outer wall and
Proximal end limits entrance, exports in the far-end and flow channel for leading at least one air bag, in interior vehicle
Air is flow in the flow channel, so that air bag expands.Suction system is connected to shell and is configured to high pressure gas
It is directed in flow channel to be mixed with the air of the interior space in flow channel.Suction system includes positioned internal
Gas generator has one or more be open in the outside of inner wall.Around the outer wall complete design of gas generator.These
Opening is preferably configured so that high pressure gas is basically parallel to the flow direction of vehicle space and is directed to flowing from opening
Channel enters flow channel.High pressure gas makes fluxion strap by Supersonic Flow and in a manner of interacting with the surface of inner wall
The transverse cross-sectional area for the gas filling flow channel come in
The present invention can realize in the form of at least two.In some embodiments, high pressure gas passes through single on outer wall
Circumferential slit enters central suction room, and in other embodiments, high pressure gas passes through multiple nozzles.The disclosure is normally limited to first
Kind slit geometry, but some aspects are suitable for the embodiment of nozzle
It is possible to provide many additions and modification to the above-mentioned system being preferred, and will be described below these
Many possible modifications, and after reading this description, other schemes will be aobvious to those skilled in the art
And it is clear to.
Description of the drawings
The following drawings is the explanation of the embodiment of the present invention, is not meant to be only limitted to the present invention that claim is covered
In the range of.
Fig. 1 is perspective view, and cross-section shows the driver side being mounted on the steering wheel with module cover and air bag
Air bag module.
Fig. 2 is the front view for the steering wheel for including driver side airbag module according to the present invention.
Fig. 3 is the front perspective view of the steering wheel of driver side airbag module shown in Fig. 2
Fig. 4 is the sectional view of the 4-4 lines along Fig. 2.
Fig. 5 is mounted in the front view of the driver side airbag module on steering wheel, and wherein module cover and air bag is gone
It removes.
Fig. 6 is the sectional view of the 6-6 lines along Fig. 5.
Fig. 7 is the sectional view of the line 7-7 interceptions along Fig. 5.
Fig. 8 is the partial cross-sectional perspective view of the aspirator assembly for the driver side airbag module for indicating Fig. 1.
Fig. 9 is to indicate the stereogram shown in Fig. 8 for attracting device assembly.
Figure 10 is the front view of aspirator assembly shown in Fig. 8.
Figure 11 is the rearview shown in Fig. 8 for attracting device assembly.
Figure 12 is the sectional view of the line 12-12 interceptions along Figure 10.
Figure 13 is the sectional view along the 13-13 interceptions of Figure 11 center lines.
Figure 14 is the front view of the wafer assemblies (gas reflector plate) in the aspirator assembly in Fig. 9.
Figure 15 is the sectional view of the 15-15 lines in Figure 14.
Figure 16 is the rear perspective view of wafer assemblies shown in Figure 14.
Figure 17 is the front view of a thin slice in wafer assemblies shown in Figure 14.
Figure 18 is the side view of thin slice shown in Figure 17.
Figure 19 is the rear perspective view of thin slice shown in Figure 17.
Figure 20 is the front view of another thin slice in wafer assemblies shown in Figure 14.
Figure 21 is the sectional view of the line 21-21 interceptions along Figure 20.
Figure 22 is the rear perspective view of thin slice shown in Figure 20.
Figure 23 is the exploded view of aspirator assembly shown in Fig. 8.
Figure 24 shows basic geometric dimension and critical point in the slit design of aspirator shown in Fig. 8.
Figure 25 is the detailed figure of the Pulan Te Maier flows at aspirator slit
Figure 26 and 27 illustrates the principle of Pulan Te Maier streams.
Figure 28 is the fluid velocity profiles of aspirator output end.
Figure 29 is the curve graph of the fluid density of aspirator output end.
Figure 30 is the hydrostatic pressure force curve of aspirator output end.
Figure 31 is the curve graph of the fluid Mach number of aspirator output end.
Specific implementation mode
Refer to the attached drawing installs driver airbag mould wherein identical reference numeral indicates same or analogous element
Block 10 (the wherein cover board of air bag and dismounting) is mounted on generally circular steering wheel 12.Air bag module 10 and direction
Disk 12 forms steering wheel assembly 14.
Module 10 includes air suction type air bag gas generator, getter device or aspirator 16, with substantially cylinder-shaped
Shell 18, be located at shell 18 bottom end or bottom zone aspirator adverse current valve 20 so that shell 18 is located at reflux valve phase
For gas flow outlet, air bag 22, module cover component 24 comprising cover the airbag deployment lid of air bag 22 along apex zone
And module 10 is supported on 26 structure 28 of Suction gas inlet portion on steering wheel support element and is limited for entering shell 18
The entrance of air.Module 10 is supported on steering column support part 30 by direction disk support structure 28.Cover plate assembly 24 includes connection
To shell 18 and accommodate the shell of air bag 22
Shell 18 is with external substantial cylindrical surface and the inner surface with variable cross-section or wall, opposite
Single flow channel 32 is limited between end regions.Aspirator intake section 26 is also referred to as the intake section of aspirator 16.It inhales
Gas intake section 26 and reverse flow valve 20 cooperate so that flow channel 32, which has on the direction towards apex zone, to narrow
Cross section.Shell 18 is ring-shaped, it means that it surrounds channel 32, round although its inner space is not required tubulose
Cross section or cylinder.
Air (for example, vehicle's passenger compartment) from ambient air is designed to flow by reverse flow valve 20 during use
Cross and the channel 32 by being limited by aspirator intake section 26, with mix with charge air conditioning (cause air-breathing) mixed gas and
The remainder that air then passes through channel 32 enters what its channel 32 that is internal and being limited by the inner wall of shell 18 was in fluid communication
Air bag 22.
Fig. 5-7 shows the additional detail of the air bag module 10 without certain structure, such as air bag 22 and cover board group
24. adverse current valve yoke 34 of part supports reflux valve 20.Aspirator 16 includes generating the gas generator assembly 36 of gas to start gas
The aspirator diffuser 40 of a part for the expansion of capsule 22, gas generator electrical socket 38 and formation shell 18.Diffuser 40 has
There are one or multiple walls, limit a part for the outer surface of aspirator 16 and limit the opposed end regions (in Fig. 7 in channel 32
The outlet end regions in the left side in the entrance end regions and Fig. 7 on right side).
Diffuser 40 has the inner surface expanded outwardly or wall (the also referred to as air-breathing part of aspirator 16).It is big from environment
The air (for example, Vehicular occupant room) of gas is designed to then pass through reverse flow by Suction gas inlet part 26 during inflation
Dynamic valve 20, flows subsequently into and by diffuser 40.This flows through channel 32.
Aspirator intake section 26 includes center hub 42, and the suction muffler 44 being separated from each other is logical to limit the flowing between them
Road and the external rings engaged with direction disk support structure 28 or connector 46.
Aspirator 16 uses Prandtl-Meyer effects.Pervious aspirator is usually utilized and is rectified up to effect, inspiratory effects
Bad, present invention significantly improves the limitations of this air-breathing.Being intended to will not be by gas using the nozzle of Prandtl-Meyer effects
The influence of source pressure limit.By using higher pressure, the combined airflow into air bag 22 can carry at a higher pressure
For the pressure of notable bigger, it is used to open the airbag deployment cover board of component 24 and initially deployment balloon 22.This is also provided for pressure
More design spaces.For example, reaching effect using rectifying, it is difficult to reach the gasbag pressure of even 3psi, and Prandtl-Meyer is imitated
It should can be easily attained 6psi or more
The principle that the effect of module 10 makes air bag 22 expand is as follows.Can have known to those skilled in the art of the invention
Any structure and trigger mechanism gas generator assembly 36 gas generator 48 from air bag sensor and diagnostic module
(not shown) starts to generate gas after receiving signal, by being connected to inserting for gas generator 48 (being referred to as activation system)
First 38.Air bag sensor and diagnostic module can have any structure and spy known to those skilled in the art of the invention
Property, and specific type is not crucial for the present invention.Region 50 need not extend entirely around the circumference of gas generator 48,
And this is only preferred structure
Gas generator 48 continues to generate gas, and then gas starts to cause the expanding gas from circumferential expansion area 50 logical
Fig. 8 and Figure 12 are crossed, circumferential slit 52 shown in 13.Slit 52 need not extend entirely around the circumference of gas generator 48, this
It is preferred structure
Due to Prandtl-Meyer flowing effects, the air-flow outflow from slit 52 is attached on wall 54 and across limit
The flow channel diffusion being scheduled between wall 54 and opposite wall 56.Wall 54 is proximate to the wall of the outlet end regions of aspirator and wall 56 is
Near the wall of the entrance end regions of aspirator 16.High-speed jet is in the aspirator inner space 58 limited by diffuser 40
Area of low pressure is generated after slit 52.Reflux valve 20 shown in meanwhile is opened by environment inspiratory airflow.When gas occurs from gas
When device 48 starts flowing, reflux valve 20 (it includes the flap 60 in initial off primary flow path or channel) is since pressure is after slit 52
Face and open.Therefore, surrounding air passes through the gas channel between being limited to suction muffler 44 by inner space 58 is inhaled into
In this type of design, aspirator 16 consists of two parts, therefore is more accurately termed as component, and inside is aspirator portion
Divide 62, outside is getter portion 64 in shell 18, reverse flow valve 20 and suction inlet part 26.The operation of reflux valve 20 is to permit
Perhaps the surrounding air sucked only flows in one direction, that is, fills what its internal channel 32 with aspirator 16 was in fluid communication
Air bag.When the pressure in each air bag reaches design value, such as when 3psi, the flow into air bag stops, and reflux valve 20
It closes.The air bag pressure will make the flap 60 similar to the reflux valve 20 of diaphragm return to its initial position, prevent to come from
The inflow that the air of vehicle compartment passes through the gas channel between suction muffler 44.As occupant and air bag dynamic Contact, gas is come from
The gas of capsule flows out (referring to Fig. 8) by the reverse flow valve clearance 66 between fin 60 and suction muffler 44.The cross section in the gap
It can be on the area of the venthole in being typically found in driver air-bag quite.Formed gap 66 partly because fin
60 surfaces close and that getter portion 62 may be contacted, but be not connected thereto.Therefore, fin 60 can be with aspirator portion
62 surface is divided to be slightly separated, to allow the outflow of air caused by being compressed by air bag
Antiflowback valve 20 is preferably made of pliable material, such as, but not limited to plastic film or fabric.Pass through cutting material shape
At one or more tabs 60, such as four tabs.Similarly, the part in the gap 66 between adjacent fins 60 passes through in cutting
The material of the heart and formed, and be also possible to cause that there are relatively thin regions at center.Antiflowback valve 20 can be with the characteristic of film
And property.
Initially, reflux valve 20 remains turned-off one section of short time, and the air bag of component 24 is opened until obtaining enough pressure
Cover board.Then, reflux valve 20 is opened, and is allowed gas to be inhaled into aspirator 16 in the channel limited by housing parts 64 and is provided air-flow
So that air bag expands required air-flow with being in fluid communication with channel.When flow reaches enough pressure, lid is opened, and air bag is opened
Begin to be unfolded.It is connect with housing parts 64 in the air bag for folding original state.After air bag is filled up by gas, reflux valve
Gas is simultaneously maintained in air bag by 20 return its initial position, and the gunpowder of gas generator 48 whole all burnts.
When reflux valve 20 is closed when gas generates beginning, at this moment if cover board cannot be opened, gas can be by anti-
Flow hole (gap 66) outflow in valve 20.When occupant resists on cover board (OOP, improper contact situation), it may send out
Raw such case.In this case, air bag will not be unfolded, to protect an occupant from injury.After air bag expansion, adverse current
After valve 20 is closed, the hole (gap 66) in reflux valve 20 provides flow resistance appropriate, to control fortune of the occupant during collision
It is dynamic.Therefore, the hole (gap 66) in reflux valve 20 replaces normal one or more holes in air bag.
Internal aspirator profile can be divided into three parts, an intake section, a cylindrical part and a diffusion
Part.Intake section can have bending or outline of straight line.As shown, intake section is straight, because this is attached partially to
Include the intake section of reflux valve 20.The length of cylindrical part is limited by the jet power parameter determined by simulation modelling
It is fixed.It additionally depends on the angle and property of gas generator 48.Diffuser portion can have different diffuser angles, and
There can be different length in its end, as shown in Figure 3.Diffuser portion start from cylindrical part end and and its
Continuously.
All components of aspirator are preferably made of plastic, such as pass through mold manufacturing.Exception is two pieces of metallic plates.Air-breathing
Part 62 includes the plastics tail portion 68 of blanket gas generator 48, that is, gas generator 48 is interior in tail portion 68 positioned at being formed in
In chamber, aspirator intake section 26 uses its center hub 42 as the fixation of the slit metallic plate of thin slice 70,72 (referring to Figure 12).
Figure 14-22 shows generally circular sheet metal 70,72, cooperates to form slit 52. in compression molding system
During making, in order to form tail portion 68 while forming channel 74 of Plastic Flow, thin slice 70,72 is fitted together,
Form tail portion 68.Mixing chamber passes through the appropriately designed formation of thin slice 70,72 by closed chamber or channel 76.Hot gas
It only flows in channel 76 and is discharged by slit 54.The head cover 78 of closed channel 76 is by 80 shape of a sheet metal 70 and side wall
It is formed by another sheet metal 72 at channel 76.Combination head cover 78 and side wall 80 generate the closing for thermal current during use
Channel 76.
Two sheet metals 70,72 are preferably for example made up of the steel plate of punching press of flat thin metal material.It can after this
With realize slit 54 by imprinting size required by precision.It, can be into one by providing radial ridges in thin slice 70,72
Step control slit separation, these ridges can control the spacing and geometry of slit 54.
Sheet metal 70,72 includes the edge with open central area, wherein being formed in the thin of the side of slit 54
The thin slice 72 of the other side of piece 70 and formation slit 54.The design profile for being tightly attached to the wall of thin slice 72 is used for when thin slice 72 is formed
Gas flowing is provided.
Figure 23 is the exploded view of aspirator 16.Aspirator 16 includes substantially cylindrical shell 18, plastics tail portion 68,
The first thin slice 70 being preferably made of metal, reverse flow valve 20 are related to the present invention, gas well known by persons skilled in the art
Generator 48, the second thin slice 72 being preferably made of metal and including wheel hub 42, the aspirator of suction muffler 44 and connection structure 46
Intake section 26 (air-breathing cavity configuration).In the shown embodiment, show plastic molded component as two parts 26 and 68.With
It can be made of glued or snap-action in the joint method of attachment component 26,68 and the rest part of aspirator 16.Alternatively, portion
Part 26,68 is formed in a plastic mould, wherein before plastic pellet is pumped in the fabrication process, 48 He of gas generator
Thin slice 70,72 is inserted into plastic mould.
As shown in figure 24, slit 54 and the shape more than the wall of slit 54, which are designed to obtain, is used for obtained gas stream
Prandtl-Meyer effects.When slot profile is connected by two parts of aspirator 16 (part is limited by thin slice 70,
Another part is limited by thin slice 72) it is formed.Toroidal expansion zone 50 is a doughnut, is used as mixing chamber, wherein coming from gas
The hot gas in generator hole 82 flows out and has the smoothed profile 84 of not sharp edges.Region 50 is by thin slice 72 in sheet metal
It is limited on 70 side (to the rear portion of aspirator 16) and the other side (front of aspirator 16).
Basic slit parameter is the width of slit 54, two obtuse angles 86,88 for being formed in the wall of thin slice 72 and opposite
In the position of the sharp edges 90 of second angle 88.The angle-determining jet-impingement direction of combination, extension and position.Angle 86,88
Design be that the gas ejected is maintained at air-breathing wall (thin slice 72) when injector flows out slit 54 from smooth thin slice 72
On.The Gas Jet of attachment can realize by the way that an angle is used only, but in this case, injector will be in low pressure
It is lower to be separated with wall (thin slice 72 is isolated), and slit design is not in two angles.
The difference that shock wave has some significant with expansion fan.In shock wave, Mach number is reduced, and static pressure increases, stagnation pressure
Power is lost, because process is irreversible.By expanding fan, Mach number increases, and static pressure reduces, and gross pressure remains unchanged.
It is constant entropy formula to expand fan.
With the supersonic airstream (or Prandtl-Meyer streams) for increasing continuously speed
Consider simplest supersonic airstream form：Translate uniform flow.In this flow, all gas particle is along flat
Walking along the street diameter is moved with constant speed.The track of particle is simultaneously streamline, airtight.
If air-flow cannot encounter any barrier in the form of solid particle or boundary (wall), gas will not encounter
Any interference.The simplest boundary that uniformly translation airflow characteristic may be changed is the straight solid wall 92 in Figure 28.
When wall 92 is parallel to flow direction arrangement, i.e., it is consistent with a wherein streamline, and if mobile gas accounts for
According to all endless spaces of 92 top of wall, and wall 92 itself also has indefinite length, then clearly in this case, wall 92
There is no any influence to air-flow (influence of viscosity is negligible).It should be noted that for curve streamline, the statement is one
As in the case of be effective, if wall 92 is consistent with streamline, do not interfere with the gas of flowing.
If there are barriers at certain wall points 94, the faint disturbance of Uniform Flow can be caused.This interference will be with
Uniform supersonic flow is spread with linear characteristic (pressure or density) parameter.The component combines to be formed from the condition with directional velocity
Determining angle [alpha] 0
sinα0=1/M
Wherein M is Mach number.The angle [alpha] 0 is known as weak disturbance propagation angle.
Figure 25 is according to the detailed view of the slit 54 of the introduction design of Prandtl-Meyer, and wherein dimension information is milli
Rice.The gas projected from generator flows out slit 54 with hypersonic velocity, is labeled as Vs.When being come out from slit 54, gas is penetrated
Stream is to be limited to the first bending point 96 on the inner wall (in the adjacent wall part 98 of slit) of diffuser 40 with about 30 degree
Flows at angles, be located at Ys and Xs axis (angle be bending point 96 before inner wall tangent line and bending point 96 after inner wall
Angle between tangent line so that inner wall itself limits obtuse angle).At the obtuse angle angle 100 formed in this way, jet stream deflecting angle
Spend α s.
When choked jet is flowed around obtuse angle angle 100, gas expansion, because the area that gas occupies increases
Add, under this expansion, as Prandtl-Meyer is instructed, gas is accelerated.This expansion fan is one group unlimited
More small dilatational waves is each that constant entropy rotates a low-angle.It is since plane Ys and complete at plane A to expand fan
At.Vector Vs becomes Vo (Vs<Vo), and after by plane A, become constant again along the gas velocity of wall.Slit phase
Adjacent wall part 98 has straight line portion and bending point between the starting point and bending point 96 near the stretching, extension point of slit 54
Another straight line portion between 96 and 102.Straight wall extends around tail portion 68.
The bending point 102 being limited on the inner wall of diffuser 16 is the barrier as the weak disturbance source in air-flow.These
Uniformly to flow through straight line B propagation, B lines detach the air-flow not interfered with the air-flow of disturbance for disturbance.Second expansion fan
(bending point 102) is related to axis x and y.This means that the disturbance of the gas property generated due to flowing through angle 104 is in B'
Next line is also constant, is also straight line.This means that the determination of all separation come out from bending point 102 is characterized in directly
Line.Therefore, flowing becomes new direction, and is carried out in the angle B-B' between two linear characteristics.In order to become apparent from,
Continuous gas expansion area is segmented into the greater amount of set with small but consecutive variations parameter.
First Secondary Shocks of speed and pressure are happened in the plane with plane B.Since pressure declines, managed according to impact
By with the relevant normal speed component increases of plane B.Further, since the invariance of tangential speed component, flowing slightly changes it
Impact plane is deviateed in direction.
Gas jet after impacting plane B by increasing its speed.The pressure of gas, density and temperature are declined slightly.
The disturbance that should be propagated from this time by the new plane B' lower pressure regions limited is due to injection gas deflection and horse
Conspicuous number increases and is located at the right side of plane B.
Second Secondary Shocks are combined with plane B', and cause and the new injection deviation of V1 vector directions and with increased speed
Spend simultaneous gas expansion.The steady state value more than V0 (before bending point 102) is presented in gas velocity V1, i.e., along aspirator
Cylindrical wall 106.
If the gas jet close to wall will be parallel to aspirator cylindrical wall portion 106, flowing rotation will terminate.Cause
This, near wall, velocity vector is parallel to aspirator cylindrical wall portion 106
It is well known that individually adiabatic expansion impact is impossible.However, will be detached according to above-mentioned theory (weak impact)
Angle 108 is divided into an infinite number of unlimited low-angle, and continuous gas will be caused to expand fan；Rather than the weak impact of limited quantity,
An infinite number of characteristic will be obtained, i.e. Prandtl-Meyer expands fan.
Therefore, the flowing deviation near the obtuse angle angle 104 of associated gas expansion (pressure reduction) can be with
It is described as a series of weak disturbances, source is the sharp edges of bending angle 104.
Supersonic speed pulse gas generator with various nozzles and its position in generator mixing chamber it is substantially square
The operability verification of case is the ability in corner deviation angle based on supersonic flow, this is true by Prandtl-Meyer functions
Fixed.
As the principle of gas pulses injector designs, Prandtl-Meyer formula allow Supersonic Flow parameter and spray
The geometry of mouth-mixing chamber connects.
Plane stability is flowed, is depended on and horse in the angular deviation θ of the hypersonic air flow velocity vector of a corner
The conspicuous relevant Prandtl-Meyer functions of number：
In the expansion wind turbine of appearance, the thermodynamic parameter of medium is as described below：
Expansion fan angle degree is equal to
γ is specific heat ratio. γ are specific heat.
Prandtl-Meyer functions describe the ideal polytropic gas plane when not influenced by another wall of mixing chamber
The thermodynamic parameter of Supersonic Flow in stream.
When gas nozzle is located at the outer wall of axial symmetry gas generator, planar expansion wave is by pair in gas generator
The influence of the convergence characteristic line in axis direction, this influence is claimed to make pressure reduction.When the internally positioned main body of nozzle, divergence characterization
Line increases under pressure.
It note that the instability of flow in impact type generator.
Therefore, the assessment based on Prandtl-Meyer functions is first approximation, explains the physics in gas generator
Process, and provide the direction of further development gas generator design.Although this suction system can be by testing and missing
Difference tests to develop, but this process may be very long and cumbersome, so recommending mathematical modeling calculates fluid dynamic
It learns.
In order to optimize gas generator design, it is contemplated that the property (viscosity, turbulent flow) of the actual flow in inflator solves
Following equation group：
We=Vx+Vyfy+Vzfz
Figure 26 shows the calculating speed vector at characteristic curve derived from Prandtl-Meyer functions.Position 108 indicates
Bending angle be supersonic gas flowing in interfere the reason of.
Figure 28-31 provide along characteristic curve result of calculation (solid line correspond to Figure 26 in angle [alpha] o110 at feature
Line, dotted line correspond to the vector value along line at the α 1 112 in Figure 19).These charts are bright, close to gas generator wall
In region, Prandtl-Meyer functions highly desirably describe the Supersonic Flow in the joint of nozzle and mixing chamber
Thermodynamic parameter.Except this narrow region, the processing of this simplification is unacceptable, it is that allow will be in mixing chamber
Flow parameter and the matched numerical simulation of external condition.Figure 28-31 indicates the calculating parameter value (pressure along feature α o and α 1
Power, density, speed and Mach number).Axis X corresponds to line 110 or line 112 in Figure 26, and Y-axis corresponds to along line 110 and line
112 vector value.
In Prandtl-Meyer streams, these parameters do not change radially；They send out when being transformed into another row from a line
Changing.Solid line corresponds to the attribute at angle [alpha] 0, and dotted line corresponds to the attribute at α 1.
Calculation shows that arrive the transition period of attribute 1 in dependence 0, attribute with the increase for reducing pressure and Mach number and
Change, but will not be remained unchanged along these attributes.This is the principle flowed based on Prandtl-Meyer
Figure 28 shows that the speed along line B and B' started at bending point 96 based on Prandtl-Meyer functions is become
Change.The size (m/s) of speed is vertical axis, and position (m) is trunnion axis.Solid line is the characteristic curve at angle a0, and dotted line is angle
Characteristic curve at a1.
Figure 29 shows that the density along line B and B' started at bending point 96 based on Prandtl-Meyer functions is become
Change.Density (kg/m3) is vertical axis, and position (m) is trunnion axis.Solid line is the characteristic curve at angle a0, and dotted line is at angle a1
Characteristic curve.
Figure 30 shows the static pressure along line B and B' started at bending point 96 based on Prandtl-Meyer functions
Power changes.Static pressure (atm) is vertical axis, and position (m) is trunnion axis.Solid line is the characteristic curve at angle a0, and dotted line is angle a1
The characteristic curve at place.
Figure 31 shows that the Mach number at the line B and B' started at bending point 96 based on Prandtl-Meyer functions is become
Change.Mach number is vertical axis, and position (m) is trunnion axis.Solid line is the characteristic curve at angle a0, and dotted line is the feature at angle a1
Line.
Using obtaining the main object of the present invention in any one or more of the above structure in various configurations, including but
It is not limited to：
1. providing a kind of gas-bag system, stop inflating when pushing down detonation cover board with driver, to greatly reduce by
The occupant injury caused by airbag aeration.
2. providing very inexpensive gas-bag system by eliminating most of propellant, gas is thus greatly reduced
The size and cost of device, improve safety.
3. by eliminating the demand to crumple zones crash sensor, very inexpensive air bag system is provided.
4. when gas-forming agent combustion product contains the pollutants such as carbon dioxide, is fully diluted by air-breathing and come from gas
The combustion product of generator, to form environment of breathing freely after air-bag deployment.
5. being eliminated to passenger type sensor by using the air suction type inflatable safety airbag that will not generate injury to occupant
Demand.
6. eliminating the needs of multi-stage ignition gas generator.
From the detailed description of above preferred embodiment, other objects and advantages can become apparent.
This application involves U.S. Patent number 5,505,485,5,653,464,5,684,701,5,746,446,5,772,
238,5,863,068,6,149,194,6,175,787,6,179,326,6,234,519,6,250,668,6,326,704,6,
328,126,6,410,265,6,484,080,6,532,408,6,533,316,6,557,889,6,609,903,6,685,
218,6,715,790,6,733,036,6,738,697,6,823,244,6,905,135,7,040,653,7,481,453,7,
744,1227,820,566, it is all these to be all incorporated herein by reference, and as a Shen of one of these patents publication
Any application of previous generation applications or continuity application please.
In addition, any of the above described application, publication and patent are incorporated herein by reference in their entirety, and as part of it.
Although several preferred embodiments illustrated and described above can make for executing the component of identical function
With other geometries, sensor, material and various sizes of combination.Invention disclosed herein is not limited to the above embodiments, and
And it should be determined by appended claims.Other than those described above, there are many more additional applications.Considering this specification
With its preferred embodiment is disclosed attached drawing after, many variations of the invention, modification, variation and other purposes and application for this
Field technology personnel will become obvious.Do not depart from all these changes of the spirit and scope of the present invention, change, variation and
The present invention that other purposes and application are considered being limited only by the following claims is covered.
Claims (10)
1. a kind of air suction type air bag gas generator, including：
Shell limits the inner passage with first end region and the second end region, and is configured to work as and is connected to institute
The inside of at least one air bag is directed to when stating shell；
Suction gas inlet part is connected to the shell at the first end region and limits gas flow channel；
Between the gas flow channel limited by the Suction gas inlet part and the channel limited by the shell
The gas flow channel between reverse flow valve, the reverse flow valve selectively makes the gas by the suction
Gas intake section limit gas flow channel and by the shell depend on the reflux valve opposite side on pressure difference；With
Gas generator assembly is arranged to be connected and be configured to generate gas with the shell；
The gas generator assembly includes the first thin slice and the second thin slice, is limited between first thin slice and the second thin slice
There are circumferential expansion area and circumferential slit, the gas that the gas generator assembly generates to flow into the expansion by the slit
Area, subsequently into the channel between the flow valve and the first end region limited by the shell,
Thus the gas generator assembly and the shell are configured to provide supersonic flow, stream in the exit of the slit
Enter in the channel limited by the shell.
2. air bag gas generator according to claim 1, wherein first thin slice is closer to described in the shell
First end region, and second thin slice is closer to the second end region of the shell, the first thin slice packet
Wall is included, the gas that the gas generator assembly generates flows through the breathing space on the wall with mode of extension.
3. gas generator according to claim 1, wherein the reverse flow valve includes flexible tabs, when the shell
It is flexible when pressure in the channel limited is less than the pressure in the gas flow channel limited by the Suction gas inlet
Tabs, which flexes inward into the channel limited by the shell, makes gas be introduced into the channel limited by the shell,
And the configurations of tabs, which is higher than at the pressure in the channel limited by the shell in the gas flow channel, to be limited
Being configured to be bent outwardly to the channel limited far from the shell when fixed pressure is made by the Suction gas inlet part
Gas in the channel limited by the shell is flowed out from the channel outlet limited by the shell.
4. gas generator according to claim 3 surrounds the hub wherein the Suction gas inlet part includes center hub
Ring and the suction muffler that extends between the wheel hub and the ring, the suction muffler is separated from each other, to define therebetween sky
Between, the fin is still on the suction muffler frame under resting state.
5. air bag gas generator according to claim 1, wherein the Suction gas inlet part is one of air-breathing part
Point, the getter portion includes tail portion, first and second thin slice be located at the tail portion and the Suction gas inlet part it
Between.
6. air bag gas generator according to claim 1, wherein first and second thin slice is made of metal, and
The shell and the Suction gas inlet part are made of plastics.
7. air bag gas generator according to claim 1, wherein first thin slice is closer to described in the shell
First end region, and second thin slice is closer to the second end region of the shell, described first and second
Thin slice is separated from each other, and is limited according to the predetermined properties of the flow of the gas generated by the gas generator assembly described narrow
Seam.
8. air bag gas generator according to claim 1, wherein first thin slice is closer to described in the shell
First end region, and second thin slice, closer to the second end region of the shell, first thin slice limits
Fixed tool there are two first wall at obtuse angle, one relative to the second wall limited by second thin slice centre position and with it is described
The size in the centre position of the second opposite wall of one end of the second wall, described two obtuse angles is depended on by the gas generator group
The predetermined amount of flow characteristic for the gas that part generates.
9. air bag gas generator according to claim 1, wherein first thin slice is closer to described in the shell
First end region, and second thin slice, closer to the second end region of the shell, second thin slice exists
The end of the shell limits sharp edges breathing space, and the size of the sharp edges depends on being occurred by the gas
The predetermined properties of the flowing for the gas that device assembly generates.
10. a kind of air bag module, including：
Air bag gas generator as described in claim 1,
One expandable air bag is connected with the shell and is configured to outward be unfolded from the shell, limited by the shell
The fixed channel is connected to the internal flow of the air bag；
It is connected to the shell and is included in the cover board for the expansion lid for covering the air bag before the shell outward expansion
Component；With
For providing signal to the gas generator assembly to generate the activation (igniting) for the gas for causing the air bag to expand
System.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762444898P | 2017-01-11 | 2017-01-11 | |
| US62/444,898 | 2017-01-11 | ||
| US201762512463P | 2017-05-30 | 2017-05-30 | |
| US62/512,463 | 2017-05-30 |
Publications (2)
| Publication Number | Publication Date |
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| CN108466596A true CN108466596A (en) | 2018-08-31 |
| CN108466596B CN108466596B (en) | 2022-09-09 |
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ID=63221429
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810025522.5A Active CN108466596B (en) | 2017-01-11 | 2018-01-11 | Supersonic air suction type safety air bag gas generator for driver |
| CN201810025725.4A Active CN108454555B (en) | 2017-01-11 | 2018-01-11 | Supersonic flow gas generator |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810025725.4A Active CN108454555B (en) | 2017-01-11 | 2018-01-11 | Supersonic flow gas generator |
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| Country | Link |
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| CN (2) | CN108466596B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112265514A (en) * | 2019-07-08 | 2021-01-26 | 伊利诺斯工具制品有限公司 | Filter diffuser |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109253470A (en) * | 2018-09-11 | 2019-01-22 | 中国人民解放军国防科技大学 | Supersonic mixing reinforcing device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163206A (en) * | 1996-04-08 | 1997-10-29 | 大赛璐化学工业株式会社 | Air sac inflator and air sac device |
| US5890736A (en) * | 1997-06-10 | 1999-04-06 | Atlantic Research Corporation | Aspiration-type air bag inflation apparatus |
| DE19844427A1 (en) * | 1998-09-28 | 2000-04-06 | Oskar Bschorr | Reduction of airbag explosive sound when triggered carried out according anti-noise technology regulations to prevent damage to hearing sucks air from vehicle interior synchronously |
| US20080284145A1 (en) * | 1995-12-12 | 2008-11-20 | Automotive Technologies International, Inc. | Temperature-Compensated Airbag Inflator |
| CN102015379A (en) * | 2008-02-21 | 2011-04-13 | 高田-彼得里公开股份有限公司 | Airbag module for a motor vehicle |
| CN103025585A (en) * | 2010-06-02 | 2013-04-03 | 自动化技术国际公司 | Airbag system |
| US20140375032A1 (en) * | 2013-06-21 | 2014-12-25 | Toyota Jidosha Kabushiki Kaisha | Driver seat airbag system |
| CN107054269A (en) * | 2016-02-05 | 2017-08-18 | 福特全球技术公司 | The vehicle airbag of the section radially extended including maincenter part and from maincenter part |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5505485A (en) * | 1994-05-23 | 1996-04-09 | Automotive Technologies International, Inc. | Plastic film airbag |
| US20060202452A1 (en) * | 1994-05-23 | 2006-09-14 | Automotive Technologies International, Inc. | Side curtain and multi-compartment vehicular airbags |
| JP3353652B2 (en) * | 1996-10-18 | 2002-12-03 | 豊田合成株式会社 | Airbag device |
| CN201856725U (en) * | 2010-10-28 | 2011-06-08 | 延锋百利得（上海）汽车安全系统有限公司 | Improved supplementary restraint system shell |
| CN105966342A (en) * | 2016-03-25 | 2016-09-28 | 东方久乐汽车安全气囊有限公司 | Driver air bag mechanism and steering wheel provided with air bag mechanism |
-
2018
- 2018-01-11 CN CN201810025522.5A patent/CN108466596B/en active Active
- 2018-01-11 CN CN201810025725.4A patent/CN108454555B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080284145A1 (en) * | 1995-12-12 | 2008-11-20 | Automotive Technologies International, Inc. | Temperature-Compensated Airbag Inflator |
| CN1163206A (en) * | 1996-04-08 | 1997-10-29 | 大赛璐化学工业株式会社 | Air sac inflator and air sac device |
| US5890736A (en) * | 1997-06-10 | 1999-04-06 | Atlantic Research Corporation | Aspiration-type air bag inflation apparatus |
| DE19844427A1 (en) * | 1998-09-28 | 2000-04-06 | Oskar Bschorr | Reduction of airbag explosive sound when triggered carried out according anti-noise technology regulations to prevent damage to hearing sucks air from vehicle interior synchronously |
| CN102015379A (en) * | 2008-02-21 | 2011-04-13 | 高田-彼得里公开股份有限公司 | Airbag module for a motor vehicle |
| CN103025585A (en) * | 2010-06-02 | 2013-04-03 | 自动化技术国际公司 | Airbag system |
| US20140375032A1 (en) * | 2013-06-21 | 2014-12-25 | Toyota Jidosha Kabushiki Kaisha | Driver seat airbag system |
| CN107054269A (en) * | 2016-02-05 | 2017-08-18 | 福特全球技术公司 | The vehicle airbag of the section radially extended including maincenter part and from maincenter part |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112265514A (en) * | 2019-07-08 | 2021-01-26 | 伊利诺斯工具制品有限公司 | Filter diffuser |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108466596B (en) | 2022-09-09 |
| CN108454555B (en) | 2022-07-08 |
| CN108454555A (en) | 2018-08-28 |
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