Gas generator for automobile safety device

Abstract

A gas generator for an automobile safety device comprises a tubular shell, an ignition tube and a gas generating agent filled with inert gas, and is characterized in that a gas generating agent tube is inserted and welded to one end of the tubular shell, the gas generating agent is arranged in the gas generating agent tube, a first gas outlet cover is welded to the outer edge of the inner end of the gas generating agent tube, and a second gas outlet cover is welded to the outer edge of the inner end of the gas generating agent tube. A plurality of vent holes are uniformly distributed in the circumferential outer wall of the first air outlet cover; a sealing foil is fixed in the center of the inner end of the gas production chemical tube; an igniter support is inserted into the outer end opening of the gas production chemical tube, and the ignition tube is anchored in the igniter support; a buffer sleeve is sleeved between the inner end of the ignition tube and the gas production chemical tube; a nozzle is inserted into the other end of the tubular shell, a second air outlet cover is fixedly connected to the outer end of the nozzle, and a plurality of vent holes are evenly distributed in the circumferential outer wall of the second air outlet cover. A metal foil is fixed to the center of the inner end of the nozzle and used for sealing inert gas filled in the tubular shell. The filter has the beneficial effects of simple structure, stable performance, high mass production and good filtering effect.

Description

Technical Field

[0001] The utility model relates to a gas generator, in particular to a gas generator for a motor vehicle safety device. Background Art

[0002] An automotive airbag is an extremely important component in an automotive passive safety system. It can effectively protect the safety of drivers and passengers during a vehicle collision. Its function is to release gas and energy according to the signals indicated by sensors and microprocessors when the vehicle collides, so that the airbag inflates and unfolds in an expected time and form. The airbag serves as a buffer between the drivers and passengers and the vehicle interior components, thereby achieving a protective effect.

[0003] Publication No. CN102642513A discloses an internal mixing type curtain gas generator, including a housing. A high-pressure gas chamber is arranged inside the housing, and an inert gas is filled in the high-pressure gas chamber. One end of the housing is provided with a medicine chamber, and a gas generating agent is arranged in the medicine chamber. The medicine chamber and the right end of the high-pressure gas chamber are isolated by a medicine chamber sealing diaphragm. A base is installed at one end of the medicine chamber, and an ignition tube is installed on the base. The ignition tube is located inside the medicine chamber. Wherein, a gas guide cap is installed at the other end of the housing opposite to the medicine chamber, and radial and / or axial exhaust holes are opened on the gas guide cap. The gas guide cap and the left end of the high-pressure gas chamber are isolated by an outlet sealing diaphragm.

[0004] Although the above structure can achieve the function of the generator to a certain extent, there are the following defects in design and application:

[0005] 1. Since the gas generating agent is arranged in the medicine chamber at one end of the housing and is sealed by a base threadedly connected to the outer end of the medicine chamber, the base is prone to looseness during normal vehicle driving, especially when driving on a bumpy road surface, which reduces the sealing performance of the medicine chamber, causes the gas generating agent to be affected by moisture and degrade, and thus reduces the performance of the gas generator or even causes it to lose its function.

[0006] 2. Since the housing needs to withstand a certain strength of high pressure, it has high requirements for its strength and sealing performance. Generally, high-strength seamless steel pipes are selected in the industry. However, the overall structure of the housing in the existing design is complex, and the feasibility and mass production performance are relatively low.

[0007] 3. The exhaust end of the gas generator has no filtering function. After the outlet sealing diaphragm is broken open during exhaust, the fragments are easily washed into the airbag through the exhaust holes on the gas guide cap, resulting in the rupture of the airbag and secondary injury to the drivers and passengers. Content of the Utility Model

[0008] The technical problem to be solved by the utility model is to provide a gas generator for an automotive safety device with a simple structure, stable performance, high mass production performance and good filtering effect.

[0009] The technical solution of the present utility model is as follows:

[0010] A gas generator for an automotive safety device, comprising a tubular housing, an ignition tube, and a gas generating agent. An inert gas is filled in the tubular housing. The special feature is that a gas generating agent tube is inserted and welded at one end of the tubular housing. The gas generating agent is provided in the gas generating agent tube. A cup-shaped first gas outlet cover is sleeved and welded on the outer edge of the inner end of the gas generating agent tube. A plurality of ventilation holes are circumferentially and evenly distributed on the circumferential outer wall of the first gas outlet cover for discharging the high-temperature and high-pressure gas entering the first gas outlet cover. A sealing foil is fixed at the center of the inner end of the gas generating agent tube for restricting the position of the gas generating agent and sealing the inert gas.

[0011] An igniter support is inserted and press-fitted into the outer port of the gas generating agent tube, and the ignition tube is anchored in the igniter support. A buffer sleeve is sleeved between the inner end of the ignition tube and the gas generating agent tube for restricting the position of the gas generating agent.

[0012] A nozzle is inserted and welded at the other end of the tubular housing. A second gas outlet cover is sleeved and fixed at the outer end of the nozzle. A plurality of ventilation holes are circumferentially and evenly distributed on the circumferential outer wall of the second gas outlet cover for discharging the high-temperature and high-pressure gas entering the second gas outlet cover. A metal foil is fixed at the center of the inner end of the nozzle for sealing the inert gas filled in the tubular housing.

[0013] As a further preference, an inflation hole is provided on the tubular housing and a sealing plug is fixed to facilitate the filling of the inert gas.

[0014] As a further preference, an O-ring is clamped between the inner end of the outer edge of the igniter support and the gas generating agent tube to improve the sealing effect.

[0015] As a further preference, an O-ring is clamped between the ignition tube and the igniter support to improve the sealing effect.

[0016] As a further preference, a short-circuit component is clamped in the outer port of the igniter support, and the pin of the ignition tube is short-circuited through the metal elastic piece of the short-circuit component.

[0017] As a further preference, an annular groove is provided at the outer end of the nozzle, and the open end of the second gas outlet cover is pressed in the annular groove.

[0018] As a further preference, the other end of the tubular housing is in a conical shape to reduce the diameters of the nozzle and the second gas outlet cover and reduce the overall weight.

[0019] The beneficial effects of the present utility model are:

[0020] 1. By inserting and welding a gas-generating agent tube at one end of the tubular housing, with the gas-generating agent disposed inside the gas-generating agent tube, the housing structure can be simplified, the sealing performance of the agent chamber can be ensured, the working performance can be stabilized, and mass production can be improved.

[0021] 2. Since a cup-shaped first gas outlet cover is sleeved and welded on the outer edge of the inner end of the gas-generating agent tube, and a second gas outlet cover is fixed to the outer end of the nozzle fixed at the other end of the tubular housing, the high-temperature and high-pressure gas generated by the combustion of the gas-generating agent can be filtered twice through the first gas outlet cover and the second gas outlet cover, with good filtering effect, which can prevent the fragments of the sealing foil and the metal foil from flushing into the airbag and causing the airbag to burst, resulting in secondary injury to the driver and passengers. Description of the Drawings

[0022] Figure 1 is a schematic structural view of the present utility model.

[0023] Figure 2 is Figure 1 the A-A cross-sectional view of

[0024] In the figure: tubular housing 1, short-circuit assembly 2, ignition tube 3, igniter support 4, buffer sleeve 5, gas-generating agent tube 6, gas-generating agent 7, sealing foil 8, first gas outlet cover 9, ventilation hole 901, inert gas 10, metal foil 11, nozzle 12, annular groove 121, second gas outlet cover 13, ventilation hole 131, sealing plug 14. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] As Figures 1 - 2 shown, a gas generator for an automotive safety device according to the present utility model includes a tubular housing 1. A gas-generating agent tube 6 is inserted and welded at one end of the tubular housing 1, a gas-generating agent 7 is filled inside the gas-generating agent tube 6, a cup-shaped first gas outlet cover 9 is sleeved and welded on the outer edge of the inner end of the gas-generating agent tube 6, and a plurality of ventilation holes 901 are circumferentially and evenly distributed on the circumferential outer wall of the first gas outlet cover 9 for discharging the high-temperature and high-pressure gas entering the first gas outlet cover 9; a sealing foil 8 is fixedly welded at the center of the inner end of the gas-generating agent tube 6, and the sealing foil 8 covers the central hole at the inner end of the gas-generating agent tube 6 and can be broken under the action of the high-temperature and high-pressure gas generated by the combustion of the gas-generating agent 7, for restricting the position of the gas-generating agent 7 and sealing the inert gas.

[0027] An igniter support 4 is inserted and press-fitted into the outer port of the gas-generating medicine tube 6. An ignition tube 3 is anchored at the inner end of the central hole of the igniter support 4. A buffer sleeve 5 is sleeved between the outer edge of the inner end of the ignition tube 3 and the gas-generating medicine tube 6 to limit the position of the gas-generating medicine 7. The buffer sleeve 5 is made of aluminosilicate refractory fiber paper material.

[0028] An O-ring seal is clamped between the ignition tube 3 and the igniter support 4 to improve the sealing effect. An O-ring seal is clamped between the inner end of the outer edge of the igniter support 4 and the gas-generating medicine tube 6 to improve the sealing effect. A short-circuit assembly 2 is clamped in the outer port of the igniter support 4. The two insertion pins of the ignition tube 3 are short-circuited through the metal elastic sheet of the short-circuit assembly 2.

[0029] An inert gas 10 is filled in the tubular housing 1. An inflation hole is provided on the tubular housing 1 and a sealing plug 14 is welded to it for filling the inert gas and sealing the inflation hole. The inert gas 10 is composed of a mixture of argon and helium. The volume percentage of argon is 75%-95%, and the volume percentage of helium is 5%-25%.

[0030] A nozzle 12 is inserted and welded at the other end of the tubular housing 1. A stepped central hole is provided in the nozzle 12. A second air outlet cover 13 is sleeved and fixedly connected to the outer end of the nozzle 12. A plurality of ventilation holes 131 are circumferentially and uniformly distributed on the circumferential outer wall of the second air outlet cover 13 for discharging the high-temperature and high-pressure gas entering the second air outlet cover 13. A metal foil 11 is hermetically welded at the center of the inner end of the nozzle 12. The metal foil 11 covers the central hole at the inner end of the nozzle 12 and can be broken under the action of the high-temperature and high-pressure gas for sealing the inert gas filled in the tubular housing 1.

[0031] An annular groove 121 is provided at the outer end of the nozzle 12. The open end of the second air outlet cover 13 is pressed in the annular groove 121. The other end of the tubular housing 1 is in a conical shape to reduce the diameters of the nozzle 12 and the second air outlet cover and reduce the overall weight.

[0032] During operation, after the ignition tube 3 receives the ignition signal transmitted by the vehicle ECU, it explodes, and the high temperature generated by it ignites the gas-generating medicine 7. The combustion of the gas-generating medicine 7 causes the internal pressure in the gas-generating medicine tube 6 to rise, causing the sealing foil 8 to rupture.

[0033] After the sealing foil 8 ruptures, the high-temperature and high-pressure gas generated by the combustion of the gas-generating medicine 7 can enter the first air outlet cover 9 through the central hole at the inner end of the gas-generating medicine tube 6, and enter the tubular housing 1 through the ventilation holes on the outer wall of the first air outlet cover 9, thereby causing the internal pressure in the inner cavity of the tubular housing 1 to rise.

[0034] After the internal pressure of the tubular housing 1 increases, it causes the metal foil 11 to rupture, allowing the high-temperature and high-pressure gas and the inert gas stored in the tubular housing 1 to enter the second air outlet cover through the central hole of the nozzle 12; and finally enter the vehicle airbag through a plurality of ventilation holes on the outer wall of the second air outlet cover.

[0035] Although the embodiments of the present invention have been disclosed as above, it is not limited to only the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A gas generator for automobile safety device, comprising a tubular housing, an ignition tube and a gas generating agent, wherein the tubular housing is filled with an inert gas, and wherein: A gas generating medicine tube is inserted and welded at one end of the tubular shell, the gas generating medicine is arranged in the gas generating medicine tube, a cup-shaped first gas outlet hood is sleeved and welded on the outer edge of the inner end of the gas generating medicine tube, and a plurality of vent holes are evenly distributed on the circumference of the outer wall of the first gas outlet hood to discharge the high-temperature and high-pressure gas entering the first gas outlet hood; a sealing foil is fixed at the center of the inner end of the gas generating medicine tube to limit the position of the gas generating medicine and seal the inert gas; An igniter support is inserted and pressed into the outer port of the gas-generating powder tube, wherein the igniter tube is anchored in the igniter support; A buffer sleeve is provided between the inner end of the ignition tube and the gas generating powder tube to limit the position of the gas generating powder; A nozzle is inserted into and welded to the other end of the tubular shell, a second gas outlet hood is sleeved and fixedly connected to the outer end of the nozzle, and a plurality of vent holes are evenly distributed on the circumference of the outer wall of the second gas outlet hood for discharging the high-temperature and high-pressure gas entering the second gas outlet hood; a metal foil is fixed at the center of the inner end of the nozzle for sealing the inert gas filled in the tubular shell.

2. A gas generator for a vehicle safety device according to claim 1, characterized in that: A filling hole is provided on the tubular shell and a sealing plug is fixed thereto so as to fill the inert gas.

3. The gas generator for automobile safety device according to claim 1, characterized in that: An O-type sealing ring is sandwiched between the inner end of the outer edge of the igniter support and the gas-producing powder tube to improve the sealing effect.

4. A gas generator for a vehicle safety device according to claim 1 or 3, characterized in that: An O-ring is clamped between the ignition tube and the igniter support to improve the sealing effect.

5. A gas generator for a vehicle safety device according to claim 4, characterized in that: A short-circuit component is clamped inside the outer port of the igniter support, and the pin of the ignition tube is short-circuited by a metal spring of the short-circuit component.

6. The gas generator for automobile safety device according to claim 1, characterized in that: An annular groove is arranged at the outer end of the nozzle, and the opening end of the second gas outlet hood is pressed into the annular groove.

7. A gas generator for a vehicle safety device according to claim 1 or 6, characterized in that: The other end of the tubular housing is in a cone shape, which is used to reduce the diameter of the nozzle and the second air outlet hood.

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