CN212353909U

CN212353909U - Double-stage exhaust pyrotechnic generator

Info

Publication number: CN212353909U
Application number: CN202020539487.1U
Authority: CN
Inventors: 卢卫中; 郭超波; 刘建斌; 傅以明
Original assignee: Ningbo Bonded Area Arc Automotive Co ltd
Current assignee: Ningbo Bonded Area Arc Automotive Co ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2021-01-15
Anticipated expiration: 2030-04-13

Abstract

The utility model belongs to the technical field of gas generators, in particular to a two-stage exhaust pyrotechnic generator, which comprises a lower shell, an ignition barrel arranged on the lower shell, a gas producing drug outside the ignition barrel, a filter screen disc connected with the upper end of the ignition barrel in an interference manner, and an exhaust system sleeved on the upper end of the filter screen disc, wherein the exhaust system comprises a first-stage exhaust system and a second-stage exhaust system, the first-stage exhaust system comprises an upper shell sleeved on the outer side of the filter screen disc and a steel film adhered on the inner wall of the upper shell, and the top of the upper shell is provided with a first exhaust hole; second grade exhaust system is including cup jointing the exhaust hood in the epitheca outside, and evenly distributed's second exhaust hole is seted up all around to the top side of exhaust hood, zonulae occludens between epitheca, the inferior valve, through the carminative design of second grade, the one-level is carminative inside the generator, and high temperature high-speed gas passes through the one-level exhaust hole, and on the exhaust hood of effect, rethread exhaust hood exhaust gas has reduced exhaust gas's temperature, has reduced impact and injury to the air bag of air bag.

Description

Double-stage exhaust pyrotechnic generator

Technical Field

The utility model belongs to the technical field of gas generator, in particular to doublestage exhaust firework formula generator.

Background

The safety airbag is an important safety device on an automobile, and can effectively reduce the damage of an accident to a human body when the automobile has the accident, so that the life safety of a driver and a passenger is protected. An airbag inflator is a component that generates and releases gas in an automotive airbag system, and a generator vent hole is provided on the inflator to control the amount and duration of gas output.

The exhaust hole of the existing safety airbag gas generator is one-stage exhaust, the exhaust hole directly faces to the safety airbag, and high-temperature and high-speed gas from the exhaust hole can cause burn damage to the safety airbag.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

The utility model aims at the above-mentioned problem that exists among the prior art, provide a doublestage exhaust pyrotechnic generator, through the carminative design of second grade, the one-level is discharged inside the generator, and high-temperature high-speed gas passes through the one-level exhaust hole, and on the exhaust hood of effect, rethread exhaust hood exhaust gas has reduced exhaust gas's temperature, has reduced impact and injury to the air bag air pocket, has ensured the security that the gasbag used.

2. Technical scheme

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a two-stage exhaust pyrotechnic generator comprises a lower shell, an ignition barrel arranged on the lower shell, gas producing chemicals outside the ignition barrel, a filter screen disc connected to the upper end of the ignition barrel in an interference manner, and an exhaust system sleeved on the upper end of the filter screen disc, wherein the exhaust system comprises a first-stage exhaust system and a second-stage exhaust system, the first-stage exhaust system comprises an upper shell sleeved on the outer side of the filter screen disc and a steel film adhered to the inner wall of the upper shell, and a first exhaust hole is formed in the top of the upper shell; the secondary exhaust system comprises an exhaust hood sleeved outside the upper shell, second exhaust holes are uniformly distributed on the periphery of the top side of the exhaust hood, and the upper shell and the lower shell are tightly connected. The utility model discloses a pyrotechnic generator adopts the design of second grade exhaust, and the one-level is discharged inside the generator, and when the generator effect, high-temperature high-speed gas filters the residue through the filter screen dish, reduces the gas temperature after, through the one-level exhaust hole on the epitheca, on the exhaust hood of effect, the second grade exhaust hole exhaust gas on the rethread exhaust hood has reduced exhaust gas's temperature, has reduced impact and injury to the air bag air pocket, the better life safety who has protected driver and passenger.

Preferably, the first exhaust holes comprise large holes and small holes which are uniformly distributed along the circumference. At the same temperature, the smaller the area of a single vent hole, the larger the required bursting pressure of the vent hole is, and the larger the output pressure is. Increasing the gas pressure in the generator at high temperature, blasting the steel film at all holes, and opening all the big holes and the small holes; when the pressure is reduced at low temperature, the steel film at the large hole is exploded, the steel film at the small hole is not exploded, and the small hole is not opened. Therefore, the primary exhaust holes are designed to reduce the difference of high and low temperature performances through the arrangement of large holes and small holes.

Preferably, the ignition barrel is sleeved on the lower shell through a base, the base is sleeved with the ignition barrel, an electric explosion tube is arranged in the ignition barrel, an explosion transfer agent is arranged at the upper end of the electric explosion tube, and a fire transfer port is formed in the ignition barrel. The action mode of this gas generator does, electrical apparatus control unit (ECU) sends the signal of telecommunication point and explodes the electric detonator, emit flame, the biography that ignites in the ignition bucket explodes the medicine, the biography is exploded the medicine and is started burning after that, release high temperature gas and flame, ignite the product gas medicine in the ignition bucket outside through passing the burner, thereby make product gas medicine start burning, product gas medicine burning, take place chemical reaction, turn into gas, chemical energy and solid residue with self solid medicament, gas filters the residue through the filter screen dish and later rushes into the air bag air pocket through second grade exhaust system, make the air bag full of.

Preferably, the ring flange has been cup jointed to the upper end of filter screen dish, the ring flange is shell structure, the protruding first arch that forms that makes progress in ring flange top center, first arch with the ignition bucket cup joints, the top of ring flange is close to the edge all around and makes progress the arch and form the second arch, form the recess between first arch and the second arch, the recess with leave the clearance between the filter screen dish, be equipped with first through-hole on the recess, the protruding inboard week of the second of telling upwards evenly be equipped with the communicating second through-hole of shell structure inboard. Through adopting above-mentioned technical scheme, the ring flange is established to the pot head on the filter screen dish, leave the clearance between filter screen dish and the ring flange, the ring flange is strikeed to the high-temperature high-speed gas that the gas production medicine produced after filter the residue through the filter screen dish, partly gaseous first through-hole through on the ring flange is discharged, partly gaseous second through-hole through the even setting of ring flange circumferencial direction discharges, the velocity of flow of gas has been slowed down, the temperature and the pressure of gas have further been reduced, make the gas after weakening discharge from exhaust system and get into in the gasbag, the security when the gasbag uses has further been guaranteed.

Furthermore, the upper shell is sleeved outside the flange plate. Gas generated by the gas production medicine acts on the upper shell of the primary exhaust system after being decelerated, cooled and depressurized by the filter screen and the flange plate, so that the use safety of the safety airbag is fully guaranteed.

Preferably, the gas producing drug is arranged in a combustion chamber consisting of the inner wall of the filter screen disc, the upper shell, the lower shell and the outer wall surface of the ignition barrel. The gas producing medicine ensures high temperature and high pressure of gas in a closed space.

Furthermore, an automatic ignition unit is arranged in the combustion chamber and comprises an automatic ignition ring sleeved at the lower end of the ignition barrel, a circular automatic ignition hole is formed in the automatic ignition ring, and automatic ignition powder is arranged in the automatic ignition hole. The automatic ignition unit is arranged, when the gas production powder in the combustion chamber is combusted, the automatic ignition powder in the automatic ignition hole is ignited, the sufficient combustion of the gas production powder is ensured, and the secondary ignition problem is avoided.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of: the utility model discloses a doublestage exhaust pyrotechnic generator passes through the carminative design of second grade, and the one-level is discharged inside the generator, and high-temperature high-speed gas passes through the one-level exhaust hole on the epitheca, and on the exhaust hood of effect, the second grade exhaust hole exhaust gas on the rethread exhaust hood has reduced exhaust gas's temperature, has reduced impact and injury to the air bag air pocket, better protection driver and passenger's life safety.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken at C-C of FIG. 1;

fig. 3 is a schematic structural diagram of an upper shell according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a flange according to an embodiment of the present invention;

fig. 5 is an exploded view of an embodiment of the present invention.

The reference numbers in the figures illustrate:

1-lower shell, 2-ignition barrel, 3-base, 4-electric explosion tube, 5-explosion transfer powder, 6-fire transfer port, 7-filter screen disc, 8-flange disc, 9-upper shell, 10-steel film, 11-exhaust hood, 12-first protrusion, 13-second exhaust hole, 14-gas production powder, 15-large hole, 16-small hole, 17-automatic ignition ring, 18-automatic ignition hole, 19-automatic ignition powder, 20-second protrusion, 21-groove, 22-first through hole and 23-second through hole.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1, a two-stage exhaust pyrotechnic generator includes a lower housing 1, a horn-shaped base 3 is sleeved at the bottom of the lower housing 1, a horn-shaped ignition barrel 2 is sleeved outside the base 3, an electric explosion tube 4 is arranged in the ignition barrel 2, an explosion initiating agent 5 is arranged at the upper end of the electric explosion tube 4 through a connecting seat, and an ignition port 6 is arranged on the ignition barrel 2 corresponding to the explosion initiating agent 5.

The lower end of the ignition 2 barrel is sleeved with an automatic ignition ring 17, a circular automatic ignition hole 18 is formed in the automatic ignition ring 17, automatic ignition powder 19 is arranged in the automatic ignition hole 18, and the automatic ignition ring 17, the automatic ignition hole 18 and the automatic ignition powder 19 form an automatic ignition unit.

The upper end interference of ignition bucket 2 is connected with filter screen dish 7, flange plate 8 has been cup jointed to the upper end of filter screen dish 7, flange plate 8 is shell structure, 8 top centers of flange plates make progress the arch and form first arch 12, first arch 12 cup joints with the top of ignition bucket 2, the top of flange plate 8 is close to the edge all around and makes progress the arch and form the arch 20 of second, form recess 21 between first arch 12 and the arch 20 of second, leave the clearance between recess 21 and the filter screen dish 7, be equipped with first through-hole 22 on the recess 21, the inboard circumference of the arch 20 of second evenly be equipped with the communicating second through-hole 23 of shell structure inboard.

The flange plate 8 is sleeved with an exhaust system, the exhaust system comprises a first-stage exhaust system and a second-stage exhaust system, the first-stage exhaust system comprises an upper shell 9 sleeved on the outer side of the flange plate 8 and a steel film 10 adhered to the inner wall of the upper shell 9, the top of the upper shell 9 is provided with a first exhaust hole, and the first exhaust hole comprises two large holes 15 and two small holes 16 which are uniformly distributed along the circumference; the secondary exhaust system comprises a hat-shaped exhaust hood 11 sleeved outside the upper shell 9, and second exhaust holes 13 which are uniformly distributed are formed in the periphery of the top side of the exhaust hood 11.

The upper shell 9 and the lower shell 1 are tightly connected, and the exhaust hood 11 is tightly sleeved outside the upper shell 9.

The combustion chamber is composed of the inner wall of the filter screen disc 7, the upper shell 9, the lower shell 1 and the outer wall surface of the ignition barrel 2, and a gas producing medicine 14 is arranged in the combustion chamber.

The working principle is as follows: the electrical apparatus control unit (ECU) sends an electric signal, current is input into the electric detonator 4 to detonate the electric detonator 4, flame is released by the electric detonator 4 to ignite the booster 5 in the ignition barrel 2, then the booster 5 starts to burn, high-temperature gas and flame are released and are diffused to a combustion chamber through the fire transfer port 6, so that the gas producing explosive 14 starts to burn, the automatic ignition explosive 19 in the automatic ignition unit is ignited while the gas producing explosive 14 burns, and the rapid and sufficient burning of the gas producing explosive 14 is guaranteed. When 14 burning of gas production medicine, take place chemical reaction, turn into gas with self solid medicament, chemical energy and solid residue, gas reduces the gas temperature simultaneously after the residue is filtered to filter screen dish 7, strike ring flange 8, some gas is discharged through first through-hole 22 on the ring flange 8, some gas is discharged through second through-hole 23 that 8 circumferencial directions of ring flange evenly set up, the velocity of flow of gas has been slowed down, the temperature and the pressure of gas have further been reduced, gas after weakening reaches steel membrane 10 department in the epitheca 9. After the reaction starts, gas is accumulated in the combustion chamber, when the internal pressure reaches a certain value, the gas can break the steel membrane 10 and is discharged into the airbag air bag through the first exhaust hole at the upper shell 9 and the second exhaust hole at the exhaust cover, and high-temperature high-speed gas is discharged through the two stages of the upper shell 9 and the exhaust cover 11, so that the temperature of the discharged gas is reduced, the impact and the damage to the airbag air bag are reduced, and the life safety of a driver and a passenger is better protected. Meanwhile, because the pressure difference of the gas in the generator at high temperature and low temperature in the cavity has larger difference, the gas pressure in the generator is increased at high temperature, the steel film at all holes is blasted, and the large holes 15 and the small holes 16 are all opened; the pressure is reduced at low temperature, the steel film at the position of the big hole 15 is exploded, the big hole 15 is opened, the steel film at the position of the small hole 16 is not exploded, the small hole 16 is not opened, and the difference of high and low temperature performances is reduced at the position of the shell 9 through the design of arrangement of the big hole and the small hole.

The above description is only the preferred embodiment of the present invention; the scope of the present invention is not limited thereto. Any person skilled in the art should also be able to cover the technical scope of the present invention by replacing or changing the technical solution and the improvement concept of the present invention with equivalents and modifications within the technical scope of the present invention.

Claims

1. The utility model provides a doublestage exhaust pyrotechnic generator, is in including inferior valve (1), setting ignition bucket (2) on inferior valve (1), product gas medicine (14), the interference in the ignition bucket (2) outside are connected filter screen dish (7) and the cover of ignition bucket (2) upper end establish the exhaust system in filter screen dish (7) upper end, its characterized in that: the exhaust system comprises a primary exhaust system and a secondary exhaust system, the primary exhaust system comprises an upper shell (9) sleeved on the outer side of the filter screen disc (7) and a steel film (10) adhered to the inner wall of the upper shell (9), and a first exhaust hole is formed in the top of the upper shell (9); the secondary exhaust system comprises an exhaust hood (11) sleeved on the outer side of the upper shell (9), second exhaust holes (13) which are uniformly distributed are formed in the periphery of the top side of the exhaust hood (11), and the upper shell (9) and the lower shell (1) are tightly connected.

2. The dual stage exhaust pyrotechnic generator of claim 1 wherein: the first exhaust holes comprise large holes (15) and small holes (16) which are uniformly distributed along the circumference.

3. The dual stage exhaust pyrotechnic generator of claim 1 wherein: ignition bucket (2) are established through base (3) cover on inferior valve (1), base (3) overcoat is established ignition bucket (2), be equipped with electric detonator (4) in ignition bucket (2), the upper end of electric detonator (4) is equipped with biography and explodes medicine (5), be equipped with biography fire mouth (6) on ignition bucket (2).

4. The dual stage exhaust pyrotechnic generator of claim 1 wherein: ring flange (8) have been cup jointed to the upper end of filter screen dish (7), ring flange (8) are shell structure, ring flange (8) top center makes progress the arch and forms first arch (12), first arch (12) cup joint ignition bucket (2) top, the top of ring flange (8) is close to the edge all around and makes progress the arch and form second arch (20), form between first arch (12) and second arch (20) recess (21), recess (21) with leave the clearance between filter screen dish (7), be equipped with first through-hole (22) on recess (21), the institute complain the protruding (20) inboard circumference of second evenly be equipped with communicating second through-hole (23) of shell structure inboard.

5. The dual stage exhaust pyrotechnic generator of claim 4 wherein: the upper shell (9) is sleeved on the outer side of the flange plate (8).

6. The dual stage exhaust pyrotechnic generator of claim 1 wherein: the gas production medicine (14) is arranged in a combustion chamber consisting of the inner wall of the filter screen disc (7), the upper shell (9), the lower shell (1) and the outer wall surface of the ignition barrel (2).

7. The dual stage exhaust pyrotechnic generator of claim 6 wherein: the automatic ignition device is characterized in that an automatic ignition unit is arranged in the combustion chamber and comprises an automatic ignition ring (17) sleeved at the lower end of the ignition barrel (2), a circular automatic ignition hole (18) is formed in the automatic ignition ring (17), and automatic ignition powder (19) is arranged in the automatic ignition hole (18).