CN209813912U

CN209813912U - Hybrid gas generator

Info

Publication number: CN209813912U
Application number: CN201822197887.4U
Authority: CN
Inventors: 郭超波; 卢卫中
Original assignee: Ningbo Free Trade Zone Alshi Automobile Co Ltd
Current assignee: Ningbo Free Trade Zone Alshi Automobile Co Ltd
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2019-12-20
Anticipated expiration: 2028-12-26

Abstract

The utility model belongs to the technical field of car air bag, concretely relates to hybrid gas generator, including upper cover and lower cover, form the inner chamber between upper cover and the lower cover, upper cover center undercut is provided with the venthole, the lower cover is provided with the some firearm that passes the lower cover and get into the inner chamber, the inner chamber is used for saving high-pressure inert gas, it is fixed with central support to set up between upper cover and the lower cover, the inside cavity of central support, the top of central support communicates in the venthole, be provided with directly over the venthole and break the piece, central support side is provided with the inlet port, some firearm top is provided with the biography explosive, the biography explosive both sides are provided with the product gas medicine, on cover the top set up the kuppe that the side has the water conservancy. The utility model discloses the original high-pressure gas of inner chamber ignites the gas production medicine again and produces a large amount of gases through lighting the biography explosive, risees the high-pressure gas mixture pressure in the inner chamber, and gas is broken apart the rupture disc and is followed the venthole and is washed out, aerifys air bag along side guiding hole in the kuppe, effectively alleviates pressure.

Description

Hybrid gas generator

Technical Field

The utility model belongs to the technical field of car air bag, concretely relates to hybrid gas generator.

Background

When the vehicle has serious collision, the safety air bag is inflated instantaneously to protect the safety of passengers. The sensor in the safety air bag system senses the collision strength of the automobile and transmits the received signal to the electric appliance control unit, and the electric appliance control unit receives and processes the signal of the sensor and immediately sends an ignition signal to trigger the gas generator when judging that the air bag needs to be opened according to calculation.

The gas generator is mainly divided into: pyrotechnic and hybrid. After receiving the ignition signal, the pyrotechnic gas generator quickly ignites and generates a large amount of gas to expand the air bag, and the air bag breaks the air bag cover plate by huge pressure to inflate and form the air bag; the mixed gas generator receives the signal and then explodes the gas producing medicine to produce gas, and the gas produced by the gas producing medicine and the pre-stored high pressure inert mixed gas make the pressure in the generator shell increase rapidly and break the sealing sheet in the generator body to rush into the air bag, so that the air bag is filled rapidly.

At fireworks formula gas generator, can produce a large amount of heats and powder when producing gas medicine burning process gas, the user is easily scalded via the air bag transmission to the heat, and the venthole is easily blockked up to the powder, gives vent to anger not smoothly, and air bag can not expand in the short time that the car bumps, plays no cushioning protection effect. In the hybrid gas generator, the structure needs to be able to bear certain pressure, so that the inflation operation can be completed in time, and enough stability is also kept. Therefore, most hybrid gas generators have the disadvantages of complex structure, high cost, heavy weight, etc., resulting in few practical applications.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problems in the prior art, and provides a mixed gas generator which has simple structure, less heat production quantity, obvious guiding decompression and quick and stable inflation.

The purpose of the utility model can be realized by the following technical proposal: a mixed gas generator comprises an upper cover and a lower cover, an inner cavity is formed between the upper cover and the lower cover, the center of the upper cover is downwards sunken and is provided with an air outlet, the lower cover is provided with an igniter which penetrates through the lower cover to enter the inner cavity, the inner cavity is used for storing high-pressure inert gas, a central support is fixedly arranged between the upper cover and the lower cover, the center support is hollow, the top of the center support is communicated with an air outlet, a rupture disc is arranged right above the air outlet, an air inlet is arranged on the side surface of the central support, an explosion transfer medicine is arranged above the igniter, gas production medicines are arranged on two sides of the explosion transfer medicine, the upper cover is provided with a guide cover with a guide hole on the side surface, gas generated by igniting the gas producing medicine and high-pressure inert gas increase the air pressure of the inner cavity, the rupture disc is opened, and the gas flows to the air outlet along the air inlet and is finally flushed out from the guide hole to complete the inflation operation.

In the above-mentioned hybrid gas generator, be provided with the central support screen cloth between central support and the gas production medicine, one of them department of central support screen cloth side is provided with a plurality of sieve mesh, pass and explode the medicine and set up in the central support screen cloth outside, the gas production medicine sets up and explodes the medicine both sides and surround in the central support screen cloth outside and do not shelter from the sieve mesh in passing.

In the above-mentioned hybrid gas generator, the air inlet is provided with three rows and evenly sets up in central support side, sieve mesh and air inlet stagger the setting.

In one of the above hybrid gas generators, the high pressure inert gas component is argon and helium.

In the above hybrid gas generator, an explosion transfer canister is disposed above the igniter, the explosion transfer is disposed in the explosion transfer canister, and openings facing the gas generating agent are disposed on both sides of the explosion transfer canister.

In the above-mentioned hybrid gas generator, the central support is sleeved with a medicine basket, the medicine basket is provided with a plurality of medicine teeth extending downwards, and the gas producing medicine is sleeved on the medicine teeth.

In the above hybrid gas generator, a rupture disk is laser welded to the upper cover directly above the rupture disk.

In the above hybrid gas generator, friction welding is adopted between the lower cover and the upper cover, between the bottom of the central support and the lower cover, and between the central support and the upper cover, and laser welding is adopted between the air guide sleeve and the upper cover.

In the above-mentioned hybrid gas generator, a filter screen is disposed between the upper cover and the air guide sleeve, the filter screen has an arc-shaped inner ring and an outer ring with an upward turn, the inner ring of the filter screen is arc-shaped and connected to the bottom surface of the upper cover, the outer ring of the filter screen is connected to the upper part of the air guide hole of the air guide sleeve, and the inner ring is provided with a filter hole.

In the above hybrid gas generator, the central support is sleeved with an energy assembly cover, and the energy assembly cover is disposed to cover the upper portions of the booster explosive and the gas generating agent.

The utility model discloses the original high-pressure gas of inner chamber, simple structure is sealed effectual, through lighting the biography explosive and ignite the gas production medicine again and produce a large amount of gases, the high-pressure mixed gas pressure in the rising inner chamber, the gas is upwards washed out the rupture disc along the inlet port of central support side and is followed the venthole and rush out, aerifys to air bag along side guiding hole in the kuppe, and gas is followed the direction and is rushed out along setting for the route, effectively alleviates pressure, and rapid stabilization carries out air bag and aerifys.

Drawings

FIG. 1 is a schematic cross-sectional view of a hybrid gas generator according to the present invention;

FIG. 2 is a schematic view of the overall structure of a hybrid gas generator according to the present invention;

fig. 3 is an exploded view of a hybrid gas generator according to the present invention.

In the figure, an upper cover 1, a lower cover 2, an inner cavity 3, an air outlet hole 4, an igniter 5, a central support 6, a rupture disk 7, an air inlet hole 8, an explosion-propagating medicine 9, a gas-producing medicine 10, a diversion hole 11, a diversion cover 12, a central support screen 13, a screen hole 14, an explosion-propagating medicine tank 15, an opening 16, a medicine basket 17, a medicine tooth 18, a rupture disk 19, a filter screen 20, an inner ring 21, an outer ring 22, a filter hole 23 and an energy component cover 24,

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, a hybrid gas generator comprises an upper cover 1 and a lower cover 2, an inner cavity 3 is formed between the upper cover 1 and the lower cover 2, the upper cover 1 is recessed downwards at the center and is provided with a vent hole 4, the lower cover 2 is provided with an igniter 5 penetrating through the lower cover 2 and entering the inner cavity 3, the inner cavity 3 is used for storing high-pressure inert gas, a central support 6 is fixedly arranged between the upper cover 1 and the lower cover 2, the central support 6 is hollow, the top of the central support 6 is communicated with the vent hole 4, a rupture disc 7 is arranged right above the vent hole 4, an air inlet is arranged on the side surface of the central support 6, an explosive transfer 9 is arranged above the igniter 5, gas producing medicines 10 are arranged on two sides of the explosive transfer 9, a deflector 12 with a deflector hole 11 on the side surface is arranged above the upper cover 1, the gas producing medicines 10 are ignited, the air pressure of the inner cavity 3 is increased by the gas, the gas flows to the air outlet 4 along the air inlet hole and is finally flushed out from the diversion hole 11 to finish the inflation operation.

Compressed inert gas is filled in the inner cavity 3, the strength of the rupture disk 7 is set to bear the air pressure and not to break, the whole inner cavity 3 is of a sealing structure, after a collision signal is received, the igniter 5 ignites the booster 9, the booster 9 ignites the gas production drugs 10 on two sides, the gas production drugs 10 are combusted to produce gas, the air pressure in the inner cavity 3 is increased, the mixed pressure of the gas produced by the gas production drugs 10 and the original high-pressure inert gas in the inner cavity 3 exceeds the bearing limit of the rupture disk 7, the rupture disk 7 is broken by the gas and the gas is flushed outwards, the safety airbag is rapidly inflated, the gas flows into the central support 6 along the air inlet on the side surface of the central support 6 and flows upwards into the space between the upper cover 1 and the flow guide cover 12 along the central support 6 through the air outlet 4, the safety airbag is inflated from the flow guide hole 11 on the side surface of the flow guide cover 12, and is inflated in the inflating process, the central support 6 can play the role of supporting the inner cavity 3 and can also guide the airflow, the high-pressure gas is gradually decompressed in the flowing process, the damage to the generator caused by the suddenly increased pressure is avoided, the inflation process is stable and quick, the safety airbag is expanded completely in time, and the sufficient protection effect is played.

Preferably, a central support screen 13 is arranged between the central support 6 and the gas producing drug 10, one of the side surfaces of the central support screen 13 is provided with a plurality of sieve holes 14, the booster 9 is arranged outside the central support screen 13, and the gas producing drug 10 is arranged on both sides of the booster 9 and surrounds the central support screen 13 without shielding the sieve holes 14. Compressed gas and the gas that produces pass through central support screen cloth 13 earlier and get into central support 6 along the inlet port again, central support screen cloth 13 only has one side to set up sieve mesh 14, pass and explode medicine 9 and produce gas medicine 10 and all set up in the central support screen cloth 13 outside, do not set up sieve mesh 14 near passing the central support screen cloth 13 side of exploding medicine 9 and produce gas medicine 10, prevent to produce gas medicine 10 card before the generator work on sieve mesh 14, perhaps produce in the piece card of gas medicine 10 falls into central support screen cloth 13 from sieve mesh 14 during the burning, can not burn completely, weaken and aerify the effect, the gas that produces gas medicine 10 produces is guided to flow in inner chamber 3, stabilize the inflation process, avoid the generator to damage.

It is further preferred that the air inlet holes are arranged in three rows and uniformly arranged on the side surface of the central support 6, and the sieve holes 14 are arranged in a staggered manner with respect to the air inlet holes. The gas flows into the central support screen 13 from the screen holes 14 and then enters the central support 6 from the gas inlet holes, the screen holes 14 are staggered with the gas inlet holes, the screen holes 14 are right opposite to the side wall between the two rows of the gas inlet holes, and the gas flows between the central support screen 13 and the central support 6 and then enters the central support 6 along the gas inlet holes, so that the gas pressure is effectively relieved.

Preferably, the high pressure inert gas composition is argon and helium. The inert gas is used for inflating, is safe and stable, and the compressed argon and helium are mixed with the gas generated by burning the gas producing medicine 10 to inflate the safety airbag, so that the use of the gas producing medicine 10 is reduced, namely, the generation of heat and powder can be reduced, and the use safety of the safety airbag is improved.

Preferably, an explosion-transfer medicine tank 15 is arranged above the igniter 5, the explosion-transfer medicine 9 is arranged in the explosion-transfer medicine tank 15, and openings 16 facing the gas generating medicine 10 are respectively arranged on two sides of the explosion-transfer medicine tank 15. The gas production medicine 10 is ignited from the openings 16 at the two sides by the booster 9, the gas production medicine 10 at the two sides is combusted at the same time, sufficient gas and compressed inert gas are rapidly generated to jointly improve the air pressure of the inner cavity 3, the rupture disk 7 is burst open, the safety airbag is rapidly inflated, and the protection effect is rapidly achieved.

Preferably, the medicine basket 17 is sleeved on the central support 6, the medicine basket 17 is provided with a plurality of medicine teeth 18 extending downwards, and the gas producing medicine 10 is sleeved on the medicine teeth 18. The medicine basket 17 with medicine teeth 18 is sleeved above the central support screen 13 on the central support 6, the gas producing medicines 10 are sequentially arranged on the medicine teeth 18, the positioned and installed gas producing medicines 10 are sequentially arranged, and an enough combustion space is arranged inside the medicine basket, so that the medicine basket is sequentially ignited, the effect of continuously producing gas is maintained, and the combustion is thorough until the complete combustion of the safety airbag is completed.

Preferably, the cover 1 directly above the rupture disc 7 is laser welded with a rupture disc 19. Rupture disc 19 is annular structure for positioning rupture disc 7 on venthole 4 of upper cover 1, and supplementary rupture disc 7 constitutes the seal structure with inner chamber 3, guarantees to maintain stable structure before triggering.

Preferably, friction welding is adopted between the lower cover 2 and the upper cover 1, the bottom of the central support 6 and the lower cover 2, the central support 6 and the upper cover 1, and laser welding is adopted between the air guide sleeve 12 and the upper cover 1. Friction welding precision is high, and is fast, and the inner chamber 3 that forms can play stable pressure vessel structure, and the laser welding deformation is little, and kuppe 12 can carry out the decompression and accomplish the air bag again and inflate the operation with upper cover 1 cooperation.

Preferably, a filtering screen 20 is arranged between the upper cover 1 and the air guide sleeve 12, the filtering screen 20 has an arc-shaped inner ring 21 and an outer ring 22 turning upwards, the inner ring 21 of the filtering screen 20 is arc-shaped and is connected with the bottom surface of the upper cover 1, the outer ring 22 of the filtering screen 20 is arranged above the air guide holes 11 of the air guide sleeve 12, and the inner ring is provided with filtering holes 23. Two spaces are formed between the filtering screen 20 and the air guide sleeve 12 and between the upper cover 1 and are communicated by the filtering holes 23, gas is directly rushed to the bottom surface of the air guide sleeve 12 after rushing out from the air outlet 4, then enters the space between the air guide sleeve 12 and the filtering screen 20 along the filtering holes 23, and finally rushes into the safety airbag along the air guide holes 11, the solid matters mixed with the gas are filtered again by the filtering holes 23, the filtering screen 20 is light in structure and is matched with the air guide sleeve 12 to carry out filtering operation, and the gas flow can buffer the gas pressure by being turned for multiple times in the flowing process along the guide direction, so that the structure is protected, and the quick and stable inflation operation is assisted.

Preferably, the central support 6 is sleeved with an energy assembly cover 24, and the energy assembly cover 24 covers the booster charge 9 and the gas generant charge 10. The energy component cover 24 is assembled in a covering mode and arranged above the booster 9 and the gas producing agent 10, and the booster 9 and the gas producing agent 10 are kept positioned at proper positions for combustion in the combustion process, so that pressurization and work are completed.

The working principle and flow of a hybrid gas generator according to the present invention will be described below based on the above embodiments.

After receiving the signal that starts air bag, point firearm 5 lights booster 9, booster 9 ignites, booster 9 is respectively with the gas production medicine 10 ignition of both sides, and gas production medicine 10 burns and generates a large amount of gas, mixes with original compressed inert gas in the inner chamber 3, and the pressure in the inner chamber 3 surpasss the upper limit of bearing of rupture disc 7, and rupture disc 7 is broken, and gas is along sieve mesh 14, inlet port 8, venthole 4, filter hole 23 in proper order, aerifys air bag from water conservancy diversion hole 11 at last.

The utility model discloses a hybrid is gaseous to carry out inflating of air bag, compares in pyrotechnic generator, and the gas production medicine 10 quantity is few, reduces heat and powder that the burning produced, and the gas velocity of inflation is fast, sets up water conservancy diversion and buffer structure, inflates air bag fast and stably, compares in current all kinds of gas generator, and simple structure inflates fast, inflation process safe and reliable.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A mixed gas generator comprises an upper cover and a lower cover, an inner cavity is formed between the upper cover and the lower cover, the center of the upper cover is downwards sunken and is provided with an air outlet, the lower cover is provided with an igniter which penetrates through the lower cover to enter the inner cavity, it is characterized in that the inner cavity is used for storing high-pressure inert gas, a central support is fixedly arranged between the upper cover and the lower cover, the center support is hollow, the top of the center support is communicated with an air outlet, a rupture disc is arranged right above the air outlet, an air inlet is arranged on the side surface of the central support, an explosion transfer medicine is arranged above the igniter, gas production medicines are arranged on two sides of the explosion transfer medicine, the upper cover is provided with a guide cover with a guide hole on the side surface, gas generated by igniting the gas producing medicine and high-pressure inert gas increase the air pressure of the inner cavity, the rupture disc is opened, and the gas flows to the air outlet along the air inlet and is finally flushed out from the guide hole to complete the inflation operation.

2. The hybrid gas generator as claimed in claim 1, wherein a center support screen is disposed between the center support and the gas generating composition, a plurality of sieve holes are disposed at one of the side surfaces of the center support screen, the booster composition is disposed outside the center support screen, and the gas generating composition is disposed on both sides of the booster composition surrounding the center support screen without blocking the sieve holes.

3. A hybrid gas generator as set forth in claim 2 wherein said inlet holes are arranged in three rows and are uniformly disposed on the side of the center support, and said mesh holes are disposed in a staggered arrangement with respect to the inlet holes.

4. A hybrid gas generator as set forth in claim 1 wherein said high pressure inert gas component is argon and helium.

5. A hybrid gas generator as set forth in claim 1 wherein a booster charge tank is disposed above said igniter, said booster charge being disposed in said booster charge tank, said booster charge tank being provided with openings on either side thereof toward said gas generant charge.

6. A hybrid gas generator as set forth in claim 1 wherein said central support is sleeved with a drug basket, said drug basket having a plurality of downwardly extending drug tines, said gas generant being sleeved over said drug tines.

7. A hybrid gas generator as set forth in claim 1 wherein the cover directly above the rupture disc is laser welded with a rupture disc.

8. A hybrid gas generator as set forth in claim 1 wherein said lower cover is friction welded to said upper cover, said bottom of said central pedestal and said lower cover, said central pedestal and said upper cover, and said dome is laser welded to said upper cover.

9. The hybrid gas generator as claimed in claim 1, wherein a filtering screen is disposed between the upper cover and the air guide sleeve, the filtering screen has an inner ring with an arc shape and an outer ring with an upward turn, the inner ring of the filtering screen is disposed in an arc shape and connected to a bottom surface of the upper cover, the outer ring of the filtering screen is disposed over the air guide holes of the air guide sleeve, and the inner ring is disposed with filtering holes.

10. A hybrid gas generator as set forth in claim 1 wherein said central support is sleeved with an energy assembly cover disposed over said booster and gas generant compositions.