CN105439784A - Inflator propellant - Google Patents
Inflator propellant Download PDFInfo
- Publication number
- CN105439784A CN105439784A CN201510593898.2A CN201510593898A CN105439784A CN 105439784 A CN105439784 A CN 105439784A CN 201510593898 A CN201510593898 A CN 201510593898A CN 105439784 A CN105439784 A CN 105439784A
- Authority
- CN
- China
- Prior art keywords
- gas
- evolution agent
- particle
- evolution
- air bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
-
- 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
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06D—MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART)
- C06D5/00—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets
- C06D5/06—Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets by reaction of two or more solids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Air Bags (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
A propellant for an inflator, and airbag inflator and a method of producing a propellant are disclosed. The propellant comprises a plurality of granules which are adhered together such that cavities exist between the granules. Selecting the size of the granules and the volume of the cavities allows the rate of combustion of the propellant to be controlled. Propellant may be sodium azide, and the granules may be adhered together with wax.
Description
Technical field
The present invention relates to the gas-evolution agent for inflator, in particular for the gas generant solids of air bag inflator.The invention still further relates to the air bag inflator comprising gas generant solids and the method manufacturing this gas generant solids.
Background technology
Air bag is a kind of usual adopted safety device of vehicle.They are arranged on one or more position in contiguous seating passengers position, to protect passenger to avoid clashing into interior vehicle components when colliding.Air bag normally comprises flexible liner and inflator systems, and inflator systems is designed to make liner inflate when running into necessary service condition.
The air bag inflator of several types is known.Pyrotechnic inflator obtains gas source by flammable Gas Generating Material, and this material produces the gas enough making airbag cushion when lighting.The gas under pressure that stored-gas inflator utilizes some to store, it is selectively released to make airbag cushion.Hybrid inflator carries out the use of the use of gas and the gas under pressure of some storages that produce material to combine to make airbag cushion.
Pyrotechnic inflator or hybrid inflator utilize the solid of fuel, oxygenant and tackiness agent, flammable, gas-evolution agent formulation usually.Sodiumazide is the example of known solid state chemistry gas-evolution agent, and when being lighted, sodiumazide can produce the nitrogen filling up air bag rapidly.Recently, propose the alternative gas-evolution agent more efficient, toxicity is lower and more cheap, this gas-evolution agent can comprise the combination of such as nitroguanidine, ammonium nitrate or other non-metal oxidants and the rich nitrogen fuel except trinitride (such as tetrazolium, triazole and their salt).
Gas generant solids is formed as bead commonly by such as pressing or extruding.For a kind of given gas-evolution agent formulation, the amount that gas produces is determined by gas-evolution agent quality and efficiency of combustion.The surface area of bead be included in inflator by change and the ratio of quality come control combustion rate and slope, such as, by selecting bead size or the extruding profile by controlling bead.The ratio of surface area and the quality better controlled is provided simultaneously at the gas-evolution agent of extruding, they trend towards less advantage, because the gas-evolution agent of extruding requires to use tackiness agent, tackiness agent makes gas-evolution agent can through to be squeezed and this tackiness agent can contribute to discharge grade.In addition, it should be noted that and allow the drying when not breaking of the gas-evolution agent of extruding, because any little crackle crack all can change the surface area of the gas-evolution agent of synthesis, and therefore change rate of combustion.
Therefore, there are the needs improving the rate of combustion of gas generant solids and/or the control of slope used in air bag inflator system.
Summary of the invention
According to a first aspect of the invention, provide a kind of gas-evolution agent for air bag inflator system, this gas-evolution agent comprises multiple particle adhering to each other to be formed gas-evolution agent main body, and wherein between the particle of gas-evolution agent main body, there is multiple chamber.
Therefore this gas-evolution agent is the solid body with grainy texture, and it can be advantageously used for the gas-evolution agent of pyrotechnic inflator system or hybrid inflator system.Preferably this particle is shown as curved surface and/or generally spherical form.Therefore, due to the face bend of particle, keep when these particles glue and are attached to together each other misunderstand each other mouth and chamber between particles.Alternately, particle can be disc or roughly cylindrical.The surface area of gap area between the particle of gas-evolution agent main body for increasing gas-evolution agent and the ratio of quality.Region, internal clearance is had owing to producing between particles, so can think that this gas-evolution agent is solid, but air-impermeable main body.
Advantageously, by selecting the volume of the size of particle and/or the gap area in gas-evolution agent main body to come more easily control combustion rate and/or burning rate slope.The surface area increased and the ratio of quality add the rate of combustion of gas-evolution agent, and allow the chemical gas propellant formulation being shown as lower rate of combustion to be selected thus.This has many considerable advantages for inflator device, because these formulations trend towards showing the flame mechanism improved, comprises the combustion pressure of reduction and/or lower discharge grade.
Gas generant grain preferably includes fuel, oxygenant and tackiness agent.Alternately, particle comprises fuel and oxygenant, and wherein the tackiness agent of viscosity is used for by particle adhesion together.As further alternately, oxidizing agent pellets can be set to the tackiness agent of the viscosity with the wax that such as also can be used as fuel.
Gas-evolution agent can comprise sodiumazide or can be made up of such as guanidine nitrite, 5 amino tetrazoles, potassium ammonium tetrazolium or saltpetre.Other gas-evolution agent race comprises ammonium nitrate, potassium perchlorate, two Nitrocellulose, SINCO (explosive Nobel trade(brand)name).Other gas-evolution agent formulations many can be imagined in the scope of the present disclosure.
Therefore, the ability realizing lower rate of combustion or slope means the non-azide gas generant formulation that can utilize exploitation recently.These alternative formulations can have benefited from lower cost, and they trend towards more easily manufacturing and/or they trend towards showing lower discharge grade.The reduction of combustion pressure allows the generator body providing simplification to design.Such as, can being susceptible to, the plastic casing for gas-evolution agent can being used when enough bearing lower combustion pressure according to inflator systems of the present disclosure.
Gas-evolution agent main body advantageously can be molded into and in quality, and therefore can give the shape and size of the concrete needs of good repeatability in gas yield.Therefore may be customized for the shape of gas-evolution agent main body, gas-evolution agent can be installed near the lighter for ignition of air bag inflator, achieve lighting a fire sooner and/or more efficiently of gas-evolution agent.
In normal " small ball type " inflator, the generation in bead dust or the crack that can have a negative impact to rate of combustion avoided by vibro-isolator for making the motion of bead minimize.Advantageously, this gas-evolution agent can not need to use vibro-isolator.Alternatively, can increase little Crumple element or projection on the outer surface of gas-evolution agent main body, these little Crumple elements or projection can alleviate the needs that vibro-isolator is used as a part for inflator assemblies further.
The dimension/diameter of particle can between the scope of several microns (such as fine powders) to several millimeters.Therefore, the diameter of particle or cross-sectional width can between 2 microns to 10 millimeters.Multiple method for the formation of gas generant grain is conceived in the disclosure.Except the traditional method of such as pressing or extruding and cutting, other method is also possible.Such as, by being similar to by lead water is dropped onto from suitable height the method manufacturing plumb ball cold water, or alternately form particle by the mode forming ball of rolling between two plates.Those skilled in the art will be susceptible to other the method for formation particle multiple.
Particle can be formed as powder.Alternatively, each particle comprises this gas-evolution agent of gas-evolution agent " bead "-therefore and can be formed by multiple bead adhering to each other to be formed gas-evolution agent main body, and wherein single bead can be considered to the particle forming this gas-evolution agent.Small spherical particles is formed by pressing or extruding in this case.The gas-evolution agent formulation being pressed or extruding can be cut the small spherical particles providing desired size.
Alternatively, particle is adhered to together by tackiness agent or glue.Tackiness agent can be solvent-based adhesive, thermosetting adhesive, pressure sensitive adhesive or hot-melt adhesive, its with fusing form apply and cooling curing to form adhesive between particles.When thermoplastics or pressure sensitive adhesive, particle to be covered by the film of tackiness agent and then to be pressed together to form gas-evolution agent main body in a mold.Alternately, by wax or plastic material by particle adhesion together.Wax/plastics be used for particle to combine and can in gas-evolution agent postcombustion.
Alternately, gas generant grain can show magnetic properties, and it can be adhered to mutually to make them by these particles of magnetizable.Such as, particle can comprise ferric oxide.
Gap size between the particle of formation gas generant solids block depends on the size of individual particle.The size in gap also can be depending on for the performance by particle adhesion tackiness agent together.Therefore, select particle size and interstitial volume (and perviousness of gas-evolution agent main body therefore) to control or " fine setting " rate of combustion is possible accurately.
According to a further aspect of the present invention, provide a kind of air bag inflator, this air bag inflator comprises gas generant solids main body, this gas generant solids main body is formed by multiple particle adhered to each other, and makes to there is multiple gap between the particle in gas-evolution agent main body.
According to a further aspect of the present invention, a kind of method of producing gas-evolution agent according to first aspect is provided.
Accompanying drawing explanation
For a better understanding of the present invention and show how to perform the present invention, existing will by the mode of example with reference to accompanying drawing, wherein:
Fig. 1 is the schematic air bag inflator according to the first example;
Fig. 2 shows the gas-evolution agent according to the second example; And
Fig. 3 shows the inflator housing comprising gas-evolution agent according to the 3rd example.
Embodiment
Fig. 1 shows air bag inflator system, and this air bag inflator system comprises collision sensor 3, inflator and air bag 6, and wherein inflator comprises lighter for ignition and comprises the housing 4 of chemical gas propellant 5.In the example that this is concrete, this air bag inflator system is arranged in the bearing circle of vehicle.But should be understood that, the disclosure may extend to the air bag inflator being designed to configure in multiple vehicle location.
In use, when collision sensor 3 (such as by detecting unexpected deceleration) detects collision, signal is transferred to lighter for ignition, lighter for ignition is lighted gas-evolution agent and is started the burning of this gas-evolution agent, combustion generated gas, to fill up air bag 6, makes air bag 6 be launched by module lid 7.The filling of air bag causes air bag directly to occupy space before the head of officer and chest, thus stops harmful travelling forward.
According to this example, gas-evolution agent 5 is solids, ventilative and have the main body of particle form.Gap area between particle allows air infiltration to pass through gas-evolution agent, therefore with will compress during manufacture any gap or cavity extruding or the gas-evolution agent block that presses compared with, add the ratio of surface area and quality, and because this increasing rate of combustion.
Fig. 2 illustrates in greater detail the grain pattern of the semi-permeable gas-evolution agent main body 10 according to the second example.As shown in FIG. 2, particle 11 is generally for spherical and adhere to each other and make to maintain gap 12 between particles.Particle combines by a kind of adhesion material shallow layer.
Fig. 3 shows inflator device, and this inflator device comprises lighter for ignition 13 and comprises the housing 15 of gas-evolution agent 16.In this example, gas-evolution agent comprises the particle 17 of rectangle or the square cross section had roughly.This particle is formed by the gas-evolution agent bead extruded, cut with the particle 17 forming gas-evolution agent afterwards.Bead or the particle coated of cutting have wax, and wax is used for particle adhesion also to guarantee to maintain gap 12 between particles together simultaneously.
Alternatively, the method manufacturing gas-evolution agent main body can comprise the following steps: on gas generant grain, apply adhesive agent, such as, by by particle scrolling realization in adhesive agent.Such as, particle coated can be pressed together in the film of curable adhesive in a mold.This step preferably should guarantee that the space between particle is not filled.
Alternately, can by particle coated in wax or thermoplastics.Advantageously, wax can in gas generant grain postcombustion.Preferably, wax/plastics show as the fusing point between 120 degrees Celsius and 400 degrees Celsius.
Alternative further, by sintering the particle of gas-evolution agent with the step making them fuse together to manufacture penetrating gases propellant main body.
Alternative further in addition, by whipping agent to the mixture of particle and tackiness agent or slurry inflation or manufacture gas-evolution agent main body by blowing to mixture.The liquid transition be filled with is gas generant solids main body by the step that no-station pole canopy dries (freeze-drying).
Example table of the present invention reveals many technical superioritys of being shown by various chemical gas propellant formulation.The rate of combustion controlling or finely tune given gas-evolution agent formulation that is chosen as of particle size and interstitial volume provides effective mechanism.The surface area increased due to the existence in gas-evolution agent main body intermediate gap makes lower rate of combustion can produce the identical gas volume filled up in reasonable time required for air bag with the ratio of quality.This can allow the selection of alternative gas-evolution agent race to provide:
Lower combustion pressure;
Be attended by the higher gas yield of low residue.Increasing surface area can cause the easier of gas-evolution agent quality to be lighted, and makes not need higher combustion pressure to reduce residue.In inflator, normally need the pressure that 150 bar to 300 cling to.Burning more efficiently at lower temperatures also will reduce the requirement of strainer and cost;
The gas reduced exports mutability.
These advantages cause at simplification inflator design aspect potentially, especially at gas-evolution agent housing or for the further important benefit in the container of gas-evolution agent.What show in addition is the burning linear lag advantageously illustrating improvement according to gas-evolution agent of the present disclosure, extremely locating especially in normal vehicle operating temperature.
Those skilled in the art is to be understood that, although the present invention describes with the way of example with reference to one or more example, but the present invention is not restricted to disclosed example, and alternative example can be constructed when not deviating from the scope be defined by the following claims of the present invention.
Claims (12)
1. for a gas-evolution agent for air bag inflator system, described gas-evolution agent comprises multiple particle, and described multiple particle adhesion to form gas-evolution agent main body, wherein exists chamber together between described particle.
2. gas-evolution agent according to claim 1, wherein, described particle is adhered to each other by tackiness agent.
3. gas-evolution agent according to claim 2, wherein, described tackiness agent comprises wax.
4. gas-evolution agent according to claim 2, wherein, described tackiness agent comprises thermosetting adhesive or pressure sensitive adhesive.
5. the gas-evolution agent according to any one of the preceding claims, wherein, described particle is generally spherical form.
6. the gas-evolution agent according to any one of the preceding claims, wherein, described granulated becomes powder.
7. the gas-evolution agent according to any one of the preceding claims, wherein, described particle has the diameter between 2 microns to 10 millimeters.
8. the gas-evolution agent according to any one of the preceding claims, wherein, described particle comprises sodiumazide.
9. an air bag inflator, described air bag inflator comprises gas-evolution agent according to any one of claim 1 to 8.
10. produce the method for gas-evolution agent according to any one of claim 1 to 8 for one kind.
11. methods according to claim 10, described method comprises selects the size of described particle in described gas-evolution agent main body and the volume in described chamber to control the step of the expection rate of combustion of described gas-evolution agent.
12. 1 kinds generally as the method with reference to described before this gas-evolution agent, air bag inflator and the process gas propellant of accompanying drawing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1416491.7 | 2014-09-18 | ||
| GB1416491.7A GB2530295A (en) | 2014-09-18 | 2014-09-18 | Inflator propellant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105439784A true CN105439784A (en) | 2016-03-30 |
Family
ID=51869101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510593898.2A Withdrawn CN105439784A (en) | 2014-09-18 | 2015-09-17 | Inflator propellant |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN105439784A (en) |
| DE (1) | DE102015114794A1 (en) |
| GB (1) | GB2530295A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1528821A (en) * | 1975-01-08 | 1978-10-18 | Eaton Corp | Combustion gas generator for inflating inflatable collision restraint systems |
| GB1532964A (en) * | 1974-11-29 | 1978-11-22 | Eaton Corp | Gas-generating azide composition |
| CN101506125A (en) * | 2006-06-21 | 2009-08-12 | 奥托里夫Asp股份有限公司 | Monolithic gas generant grains |
| CN102414058A (en) * | 2009-04-30 | 2012-04-11 | 日本化药株式会社 | Gas generator |
| CN103517887A (en) * | 2011-05-09 | 2014-01-15 | 海瑞克里兹 | Pyrotechnic gas generator compounds |
-
2014
- 2014-09-18 GB GB1416491.7A patent/GB2530295A/en not_active Withdrawn
-
2015
- 2015-09-04 DE DE102015114794.7A patent/DE102015114794A1/en active Pending
- 2015-09-17 CN CN201510593898.2A patent/CN105439784A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1532964A (en) * | 1974-11-29 | 1978-11-22 | Eaton Corp | Gas-generating azide composition |
| GB1528821A (en) * | 1975-01-08 | 1978-10-18 | Eaton Corp | Combustion gas generator for inflating inflatable collision restraint systems |
| CN101506125A (en) * | 2006-06-21 | 2009-08-12 | 奥托里夫Asp股份有限公司 | Monolithic gas generant grains |
| CN102414058A (en) * | 2009-04-30 | 2012-04-11 | 日本化药株式会社 | Gas generator |
| CN103517887A (en) * | 2011-05-09 | 2014-01-15 | 海瑞克里兹 | Pyrotechnic gas generator compounds |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2530295A (en) | 2016-03-23 |
| GB201416491D0 (en) | 2014-11-05 |
| DE102015114794A1 (en) | 2016-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160330 |
|
| WW01 | Invention patent application withdrawn after publication |