CN210591781U

CN210591781U - Exhaust device of mixed gas generator

Info

Publication number: CN210591781U
Application number: CN201920660867.8U
Authority: CN
Inventors: 万展
Original assignee: Junsheng Automobile Safety System Huzhou Co ltd
Current assignee: Junsheng Automobile Safety System Huzhou Co ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-05-22
Anticipated expiration: 2029-05-09

Abstract

The utility model discloses a hybrid gas generator exhaust apparatus, including the aiutage and with the rupture disk of aiutage one end laminating, the aiutage is equipped with the exhaust hole, sealing connection between rupture disk and the aiutage is equipped with the grooving on the rupture disk. The utility model discloses effectively avoided the rupture membrane to drop under the air current effect, blockked up the exhaust hole, when the rupture membrane drops and blocks up the exhaust hole simultaneously, can in time enlarge exhaust hole aperture, resume the air current route.

Description

Exhaust device of mixed gas generator

Technical Field

The utility model belongs to the technical field of air bag production facility technique and specifically relates to a hybrid gas generator exhaust apparatus is related to.

Background

The gas in the car air bag is produced through the gas generating device, the gas enters the air bag device through the exhaust unit, the existing air bag apparatus, for example, a "driver air bag gas generator" disclosed in Chinese patent literature, its publication No. CN2900260Y, including the electric igniter tube, also include a shell, there is at least one air vent on the shell, the air vent is sealed by the gas seal diaphragm, there is an ignition chamber outer casing to link to said shell in the shell, form the closed space in the shell, the closed space formed by the shell is filled with enough to provide the air bag to use and its pressure is lower than the argon of the rupture pressure of the seal diaphragm; the shell of the ignition chamber is filled with a medicament which is enough to burst the shell of the ignition chamber and the gas sealing diaphragm without breaking the shell, and the electric ignition tube is arranged at an inlet on the shell of the ignition chamber and is encapsulated in the shell of the ignition chamber together with the medicament. The sealing membrane at the exhaust hole may fall off under the action of the airflow, thereby blocking the hole structure in the subsequent device, affecting the gas passage and further affecting the actual effect of the safety airbag.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome the problem that prior art seal membrane easily drops, provide a hybrid gas generator exhaust apparatus, can avoid the seal membrane wholly or the part drops under the air current effect to lead to the condition of follow-up exhaust hole jam.

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

the utility model provides a hybrid gas generator exhaust apparatus, includes exhaust stack and the rupture disk of laminating with exhaust stack one end, the exhaust stack is equipped with the exhaust hole, sealing connection between rupture disk and the exhaust stack is equipped with the grooving on the rupture disk. The exhaust device is mainly used for conveying gas generated by the gas generating device to the automobile safety airbag through the exhaust hole in the exhaust barrel, so that one end of the exhaust device, which is attached to the rupture membrane, is connected with the gas generating device, and one end of the exhaust hole is connected with the safety airbag structure. The rupture disk is mainly used for sealing high-pressure gas, when the gas generating device generates high-pressure gas, the sealing effect is destroyed by using the gas pressure, a gas passage is generated, and finally the gas is dispersed and discharged at the exhaust hole. The notch is a weakening structure on the rupture membrane, and the thickness of the notch is smaller than that of other parts, so that the notch is weaker in pressure bearing capacity and is firstly broken under the action of air pressure, and the situation that when the air pressure acts on the rupture membrane, the rupture membrane is broken at the joint of the rupture membrane and the exhaust funnel, all or part of a membrane body enters the exhaust funnel along with air flow, air passages such as an exhaust hole are blocked, and the safety airbag fails is avoided.

Preferably, the notch is located in the middle of the rupture disk and is in a cross shape. The cross-shaped notches can be uniformly divided into four pieces when the air pressure acts on the rupture membrane, the rupture part is more, the tangential contact surface of the rupture part and the air flow is smaller, the rupture part is less prone to being impacted by the air flow on the surface of the rupture membrane, the rupture part is limited by the strength of the rupture membrane, and the number of notches in the rupture membrane cannot be further increased.

Preferably, the inner wall of the exhaust funnel, which is close to one end of the rupture disk, is funnel-shaped, the opening of the exhaust funnel, which is close to the rupture disk, is larger, and the opening of the exhaust funnel, which is close to the exhaust hole, is smaller. The funnel-shaped inner wall provides an attachment surface for the rupture disk after rupture. When the rupture membrane is broken, the membrane body is attached to the inner wall of the exhaust funnel under the action of the airflow, and the airflow generates extrusion component force towards the inner wall on the membrane body due to the funnel-shaped inner wall, so that the membrane body can be tightly attached to the inner wall.

Preferably, the edge of the exhaust hole is provided with a notch, and the notch is in a cross shape. The cross-shaped notch at the edge of the exhaust hole is broken before the pressure applied to the inner wall of the exhaust cylinder reaches the pressure-bearing critical value. The wall thickness of the inner wall of the exhaust cylinder at the position is smaller than that of other parts due to the grooving, so that the pressure bearing capacity is weaker than that of other parts, when all or part of the rupture membrane enters the exhaust cylinder after being ruptured to block the exhaust hole, at the moment, the gas is blocked by being exhausted through the exhaust hole, the air pressure in the exhaust cylinder rises, the pressure applied to the inner wall of the exhaust cylinder increases, when the pressure exceeds the pressure bearing critical value of the inner wall at the grooving position, the grooving ruptures, the plate at the edge of the exhaust hole is divided into four parts which are outwards separated, the exhaust hole is expanded, the rupture membrane attached to the exhaust hole is blown out along with the air flow, the aperture of the.

Preferably, the tail end of the notch groove is provided with a through hole, and a sealing material is arranged in the through hole. The through hole is arranged at the tail end of the groove path and is used for blocking the rupture of the rupture disk at the groove. After the rupture membrane breaks from the notch, the crack outwards expands from the center of the rupture membrane along the notch, the crack still expands due to the action of air flow at the tail end of the notch, and breaks away from the track of the original notch, so that the situation that two cracks are intersected and the middle rupture membrane completely falls off is possible to occur, a through hole is formed at the tail end of the notch, the stress at the crack is dispersed at the through hole, the crack cannot be further expanded, and the continuity of the rupture membrane for a long time is ensured. The through hole is filled with sealing materials such as polytetrafluoroethylene and polyformaldehyde, and air tightness of the through hole is guaranteed.

Preferably, the exhaust pipe is of an integrally molded structure. The exhaust funnel is integrally machined and formed by lathe cutting, so that the structural strength of the exhaust funnel under the action of air pressure is guaranteed.

Preferably, the opening of the exhaust funnel close to one end of the rupture disk is of a round angle structure. The fillet structure makes the rupture disk not receive the stress of the sharp structure of aimless wall and terminal surface junction, has guaranteed that when receiving atmospheric pressure, the rupture disk is bloated in to the aimless, and the grooving part is for receiving the biggest department of pressure.

Therefore, the utility model discloses following beneficial effect has: (1) the rupture membrane is prevented from falling off under the action of airflow to block the exhaust hole; (2) when the rupture disk falls off and blocks the vent hole, the aperture of the vent hole can be enlarged in time, and the airflow channel is recovered.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

In the figure: 1. an exhaust funnel 2, an exhaust hole 3, a rupture membrane 4, an engraved groove 5, a fragile engraved groove 6 and a through hole.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Example 1

In the embodiment shown in fig. 1, the rupture disk 3 is hermetically connected to the end face of one end of the exhaust funnel 1, a cross-shaped notch 4 is arranged in the middle of the rupture disk 3, the thickness of the rupture disk 3 at the notch 4 is smaller than that of the other part, and the exhaust hole 2 is arranged at the other end of the exhaust funnel 1. One end of the vent hole 2 is connected with an automobile safety airbag device, one end of the rupture membrane 3 is connected with the gas generating device, when the gas generating device generates gas, due to the fact that the gas tightness is formed between the rupture membrane 3 and the exhaust funnel 1, the gas flow impacts on the rupture membrane 3 and is acted by the gas pressure, the rupture membrane 3 expands towards one end of the vent hole 2, when the pressure applied to the rupture membrane 3 exceeds the pressure-bearing critical value of the notch 4 on the rupture membrane, part of the membrane body of the notch 4 is broken, the crack expands outwards along the notch 4, the rupture membrane 3 is divided into four parts, the rupture membrane is attached to the inner wall of the exhaust funnel 1 along with the gas flow when being pulled at the sealing connection part of the rupture membrane 3 and the exhaust funnel 1, and the gas flow passes through the inlet of the exhaust funnel 1 at the position of the rupture membrane 3.

Example 2

In the embodiment shown in fig. 2, the rupture disk 3 is connected to the end face of one end of the exhaust funnel 1 in a sealing manner, the middle part of the rupture disk 3 is provided with a cross-shaped notch 4, the end of the notch 4 is provided with a through hole 6, the thickness of the rupture disk 3 at the notch 4 is smaller than that of other parts, the other end of the exhaust funnel 1 is provided with an exhaust hole 2, the edge of the exhaust hole 2 is provided with a cross-shaped fragile notch 54, the inner wall of the exhaust funnel 1 is designed to be a round angle with the end face, the middle section of one end of the exhaust hole 2 and the middle section of one end of the rupture disk 3 are of a funnel-. One end of the vent hole 2 is connected with an automobile safety airbag device, one end of the rupture disk 3 is connected with a gas generating device, when the gas generating device generates gas, because the rupture disk 3 and the exhaust funnel 1 have air tightness, the air flow impacts on the rupture disk 3 and is acted by air pressure, the rupture disk 3 expands towards one end of the exhaust hole 2, when the pressure applied on the rupture membrane 3 exceeds the pressure-bearing critical value of the notch 4 on the rupture membrane, part of the membrane body of the notch 4 is ruptured, the crack expands outwards along the notch 4, the crack expansion stops at the through hole 6, the rupture disk 3 is divided into four parts which are stuck on the inner wall of the funnel-shaped exhaust funnel 1 along with the air flow under the pulling of the sealing connection part of each rupture disk and the exhaust funnel 1, the air flow passes through the inlet of the exhaust funnel 1 at the rupture disk 3 and enters the safety air bag device through the exhaust hole 2 at the other end of the exhaust funnel 1.

When part of the rupture membrane 3 falls off and enters the exhaust cylinder 1 to block the exhaust hole 2, the air pressure in the exhaust cylinder 1 rises at the moment, the inner wall of the exhaust cylinder 1 is subjected to increased pressure, when the pressure exceeds the pressure-bearing critical value of the cross-shaped fragile notch 54 at the edge of the exhaust hole 2, the plate at the fragile notch 54 is ruptured, the plate at the edge of the exhaust hole 2 is divided into four pieces which are outwards turned out under the action of the air pressure, the aperture of the exhaust hole 2 is enlarged, the rupture membrane 3 on one hand can blow out the exhaust hole 2 along with the air flow, on the other hand, the aperture of the exhaust hole 2 is increased, the air flow passage is.

Claims

1. The utility model provides a hybrid gas generator exhaust apparatus, includes aiutage and the rupture disk of laminating with aiutage one end, characterized by the aiutage is equipped with the exhaust hole, sealing connection between rupture disk and the aiutage is equipped with the grooving on the rupture disk, the aiutage is close to rupture disk one end inner wall and is lou hopper-shaped, and it is great to be close to rupture disk department opening, and it is less to be close to exhaust hole department opening.

2. The exhaust apparatus for a hybrid gas generator as set forth in claim 1, wherein said score is formed in the middle of the rupture disk, and the score is formed in a cross shape.

3. The hybrid gas generator exhaust device according to claim 1, wherein said exhaust hole has a notch formed at an edge thereof, said notch having a cross shape.

4. The hybrid gas generator exhaust device according to claim 2, wherein the chamfered end has a through hole with a sealant disposed therein.

5. The hybrid gas generator exhaust device according to claim 1, wherein said exhaust stack is of unitary construction.

6. The hybrid gas generator exhaust device according to any one of claims 1 to 5, wherein the vent tube has a rounded configuration at an opening adjacent the rupture disk.