CN1121473A

CN1121473A - An airbag filling arrangement

Info

Publication number: CN1121473A
Application number: CN94117647A
Authority: CN
Inventors: 奥瓦·斯万森
Original assignee: AGA AB
Current assignee: AGA AB
Priority date: 1994-10-24
Filing date: 1994-10-24
Publication date: 1996-05-01
Anticipated expiration: 2014-10-24
Also published as: CN1059865C

Abstract

The preent invention relates to a device for aerating instantaneously the empty soft container while sudden retardation is happened. The aerated container acts on the air bag for reducing damage and absorbing impulsive force. Said device consists of a high pressure aerating air collector, a conduit for connecting the collector and said container. While the retardantion force surpasses a minimum value, the retardation meter and the opening derice for opening the channel between the collector and container are opened. The collector is composed of two pressure cylinders, one charged with oxygen and inert gas, the other charged with hydrogen and inert gas, each cylinder is closed by closing device and connects to a conduit leading to the common conduit connecting to the soft container.

Description

Airbag filling arrangement

The present invention relates to when the unexpected glancing impact of vehicle that empty flexible container is housed to the instant gas filed device of this container, thereby just in case prevent that passengers inside the car are injured or reduce injured degree under the situation that vehicle bumps against.

Some automobile is equipped with so-called " airbag " with fill-in or substitute as safety strap or safe driving, and these airbags that are positioned at driver and passenger the place ahead are inflated rapidly so that prevent that they are injured because of being fallen to bearing circle or instrument carrier panel.

Up to the present, do not have the rear rider air bag, this may be because purely owing to gas dynamical reason, and the airbag of back seat is much bigger.

In headon collision or make in the collision of any other form that vehicle stops suddenly, this container personnel onboard knocks before front stall back or bearing circle and/or the instrument carrier panel rapidly that inflation forms airbag, because the speed of a motor vehicle of passenger when continuing with vehicle collision in car moved.

For enough protections are provided, the estimation airbag must be finished inflation in the time at centisecond.

Suppose that the speed of a motor vehicle is 110 kilometers/hour when collision, the physiognomy that sit onboard this moment will move forward 0.3 meter for ground.Because actual car body can't stop immediately because one or several decimeter of car preshoot distance, so the driver on the car and passenger also can be in 0.01 second time move forward the distance of a decimeter or two decimeters with respect to car body.This just means that before above-mentioned 0.01 second time, airbag must be substituted the bad for the good in case driver or passenger bump against the back of bearing circle or instrument carrier panel or front stall.

When gas expanded, under the situation of this noenergy exchange (constant entropy adiabatic process), because so-called " Jiao Er-Thomson " effect, temperature can descend usually.

With regard to air or nitrogen, temperature can descend about 70 ° to 100 ℃, and this makes them expand into 2 crust from 400 crust.Therefore, when being stored in the high pressure vessel, must or corresponding heat be offered gas reaching the volume that gas is at room temperature had, or pressure container must fill 30% gas more to the airbag blanketing gas.

This decline except temperature, what must keep firmly in mind is, nitrogen or other gas have about 1.2 coefficient of compressibility under 400 bar pressures, must consider above-mentioned coefficient of compressibility when determining this container big or small, because compare with the situation of idea1 gas, must corresponding raising pressure or volume.

Another problem relevant with all macromolecule gases is that here effluent air has a lower speed, because the gas discharge velocity is the function of molecular weight gas and gas temperature.

The purpose of this invention is to provide a kind of when the automobile that empty flexible container is housed is subjected to huge impulsive contact force at once to the gas filed device of this container, wherein, aeration vessel is as the airbag that reduces injured degree, absorption impulse force, this device comprises a gas filed high pressure vessel, one is connected to the conduit of above-mentioned flexible container to this pressure container and when the deceleration of vehicle surpasses a minimum value, perform fighting a device and a deceleration table that is used for path between build-up pressure container and the flexible container.

According to the present invention, this purpose is finished by having hereinafter the device of the described feature of independent claims.The most preferred embodiment of apparatus of the present invention is clear illustrating from dependent claims.

Be described in detail the present invention according to accompanying drawing below.

Fig. 1 illustrates two and a conduit bonded assembly compressed gas cylinder, and this conduit links to each other with the airbag of sky.

Fig. 1 illustrates an end and is connected to main pipe 5 on the unaerated airbag (not shown).The other end of this main pipe is branched off into two connecting

ducts

3 and 4 by a bifurcated.

Arm

3 and 4 is linked compressed gas cylinder 1 and 2 respectively.Gas cylinder is sealed with the explosion panels that blast starts, and two explosion panels are opened simultaneously when vehicle decelerates to a certain degree (for example collision) suddenly.Gas cylinder 1 and 2 comprises the gas of essential total amount.

First gas cylinder is filled with helium and capacity is at most another inert gas of 50%, for example argon gas and/or nitrogen.Gas cylinder 1 also is filled with oxygen, the content of oxygen can gas cylinder 1 and 2 gas total volumies 2.5% to 20% between.Second gas cylinder also is filled with helium and capacity is at most another unreactable gas of 50%, for example argon gas and/or nitrogen.Gas cylinder 2 also contains 3%～15% the hydrogen that is equivalent to gas cylinder 1 and 2 gas total volumies.Gas cylinder 1 and 2 preferably contains mutually with a kind of unreactable gas or gas mixture.Unreactable gas is helium preferably, and helium has accounted for the overwhelming majority of unreactable gas.

Under the situation of slowing down suddenly, the explosion panels explosion on the gas cylinder 1 and 2, two interior gases of gas cylinder flow into main pipe 5.The hydrogen-oxygen compound is lighted in the blast that bursts explosion panels, causes chemical reaction and generates water.

Because this reaction, temperature rises greatly, is enough to compensation owing to nitrogen and the caused cooling effect of argon free expansion, and this also makes airbag inflation desired gas capacity is reduced.

Owing to for the purpose of the safety, can not be stored in oxygen-hydrogen mixture in the same container, so they are sub-divided in two gas cylinders, after two gas cylinders were opened simultaneously, they mixed mutually before arriving airbag.

The plate end importantly, the pressure container that is used for filling collision airbag must not leak, and still can keep necessary pressure after inflation in the several years.Because highly sensitive helium leakage detector is beaten hand and can be got, be helium favourable as gases used one-tenth component therefore.

Claims

One kind when suffering huge deceleration force to the instant gas filed device of flexible container, wherein, aeration vessel is as reducing injury, absorb the airbag of impulse force, this device comprises a high-pressure aerated gas cylinder (1,2), a gas cylinder (1,2) link the conduit (5) of above-mentioned aeration vessel, an opening device and one of opening path between gas cylinder (1,2) and the aeration vessel when deceleration force surpasses a minimum value slows down and shows, and it is characterized in that, gas cylinder is by two pressure cylinders (1,2) form, each gas cylinder is closed by closing appliance separately, and each gas cylinder links to each other with separately connecting duct (3 and 4), this two connecting duct connects to common conduit (5), this common conduit (5) connects to not with the flexible container of intermediate combustion chamber, and a pressure cylinder (1) is filled with oxygen and unreactable gas, and another container (2) is filled with above-mentioned unreactable gas and hydrogen, wherein, unreactable gas comprises helium and the argon and/or the nitrogen of 50% capacity at the most.
2. device according to claim 1 is characterized in that hydrogen content is equivalent to 3% to 15% of two contained gas total volumies of gas cylinder.
3. device according to claim 1 and 2 is characterized in that, oxygen content is equivalent to 2.5%～20% of two contained gas total volumies of gas cylinder.
4. require one or multinomial described device according to aforesaid right, it is characterized in that the capacity of two pressure cylinders is identical.
5. require one or multinomial described device according to aforesaid right, it is characterized in that unreactable gas is a helium.