CN210035066U

CN210035066U - Gas generator

Info

Publication number: CN210035066U
Application number: CN201920678763.XU
Authority: CN
Inventors: 石俊涛; 屈纯; 崔兵彦; 张文龙; 牛同锋; 陈淑娟; 杨威; 姚俊
Original assignee: Hubei Institute of Aerospace Chemical Technology
Current assignee: Hubei Institute of Aerospace Chemical Technology
Priority date: 2019-05-13
Filing date: 2019-05-13
Publication date: 2020-02-07
Anticipated expiration: 2029-05-13

Abstract

The utility model relates to a gas generator, this gas generator includes: the valve body (37) is internally provided with a cavity, the cavity comprises an upper high-pressure cavity (371) and a lower exhaust cavity (372) which are communicated with each other, and the lower exhaust cavity (372) is provided with a puncture needle mechanism (36); a valve cover (31) connected to the upper end of the valve body (37), the interior of the valve cover being communicated with the upper high-pressure chamber (371); an electric explosion tube (33) is arranged in the valve cover (31); and a compressed gas cylinder (38) connected to a lower end of the valve body (37). The utility model provides a gas generator sets up the electric explosion pipe in the valve body cavity, establishes high-pressure chamber drive felting needle mechanism, and need not hold in the palm the fixed felting needle mechanism of elastomer such as with the help of the spring, simple structure, and safe and reliable, and gaseous release is fast.

Description

Gas generator

Technical Field

The utility model relates to a gas generator technical field, in particular to a gas generator for aerifing for protective airbag.

Background

Gas generators are commonly used in airbags to rapidly release gas to inflate the airbag. Most of gas generators in the prior art are complex in structure and are not suitable for being used in human body protection airbags. And simple structure, gas release is slower, and factor of safety is lower. In the prior art, a gas generator also adopts a chemical substance reaction to generate gas, wherein a booster tube directly detonates the chemical substance in the safety airbag to react to generate gas, and although the gas generation speed is high, the combustion gas temperature of a chemical agent is high, the sound is violent, the danger is higher, and the safety and reliability are low.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to the aforesaid not enough, provide a safe and reliable, simple structure, and the quick gas generator of gas release.

The utility model discloses a realize through following technical scheme:

a gas generator, the gas generator comprising:

the valve body is internally provided with a cavity, the cavity comprises an upper high-pressure cavity and a lower exhaust cavity which are communicated with each other, and the lower exhaust cavity is provided with a pricking pin mechanism;

the valve cover is connected to the upper end of the valve body, and the interior of the valve cover is communicated with the upper high-pressure cavity; an electric explosion tube is arranged in the valve cover; and

and the compressed gas cylinder is connected to the lower end of the valve body.

Further, the gas generator, the valve gap top sets up the short circuit ring seat, the short circuit ring seat with the electric blasting tube is connected.

Further, in the gas generator, the exhaust hole communicated with the outside is formed in the exhaust cavity part at the lower part of the valve body.

Further, in the gas generator, the gas in the compressed gas cylinder includes at least one of carbon dioxide and nitrogen.

Further, in the gas generator, the gas in the compressed gas cylinder further comprises helium.

Further, the gas generator, the electric detonator through set up in the electric detonator clamping ring in the valve gap install in the valve gap.

Further, in the gas generator, a first sealing ring is arranged between the electric explosion tube and the valve cover.

Further, in the gas generator, a second sealing ring is arranged between the pricking pin mechanism and the valve body.

Further, in the gas generator, the needle has a sharp angle of 60-80 degrees.

Further, in the gas generator, the sharp angle is 70 °.

The utility model has the advantages and effects that:

the utility model provides a gas generator sets up the electric explosion pipe in the valve body cavity, establishes high-pressure chamber drive felting needle mechanism, and need not hold in the palm the fixed felting needle mechanism of elastomer such as with the help of the spring, simple structure, and safe and reliable, and gaseous release is fast.

Drawings

Fig. 1 shows a schematic structural diagram of a gas generator provided by the present invention;

FIG. 2 is a schematic view of the lancet mechanism of the gas generator provided by the present invention;

FIG. 3 is a schematic plan view of the lancet mechanism of the gas generator provided by the present invention;

fig. 4 to 6 are schematic diagrams showing the movement process of the puncture needle mechanism after the electric squib of the gas generator provided by the invention is excited.

Description of reference numerals: 31-a valve cover, 32-a short circuit ring seat, 33-an electric explosion tube, 34-an electric explosion tube compression ring, 35-a second sealing ring, 36-a needle mechanism, 361-a needle and 362-a moving part; 37-valve body, 371-upper part high pressure chamber, 372-lower part exhaust chamber, 373-exhaust hole, 38-compressed gas cylinder, 39-first sealing ring.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following drawings in the embodiments of the present invention are combined to perform more detailed description on the technical solution in the embodiments of the present invention. The described embodiments are some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:

in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the invention.

Fig. 1 shows a schematic structural diagram of a gas generator provided by the present invention. The gas generator includes a valve body 37, a valve cap 31 attached to the upper end of the valve body 37, and a compressed gas cylinder 38 attached to the lower end of the valve body 37. The valve body 37 is a cavity which comprises an upper high-pressure cavity 371 and a lower exhaust cavity 372 which are communicated with each other, and the lower exhaust cavity 372 is provided with the puncture needle mechanism 36. The lower part of the valve body 37 is provided with an exhaust hole 373 communicated with the outside, and the lower cavity of the valve body forms a lower exhaust cavity 372. The valve cap 31 is internally communicated with the upper high-pressure cavity 371, and an electric explosion tube 33 is arranged in the valve cap 31. The squib 33 is energized and the upper cavity in the valve body 37 establishes high pressure forming an upper high pressure chamber 371.

The top of the valve cover 31 is provided with a short circuit ring seat 32, and the short circuit ring seat 32 is connected with an electric detonator 33. The short circuit ring seat can prevent accidental triggering caused by external electrostatic interference, and safety is improved. When the connector of the falling detection control module is not inserted into the short circuit ring seat 32, the short circuit ring seat 32 can connect the two binding posts of the electric explosion tube 33 in a short circuit manner, so that the electric explosion tube 33 can be prevented from being excited by static electricity or other external interference accidents, and the safety of the gas generator during independent storage is improved; when the connector of the falling detection control module is inserted into the short circuit ring seat 32, the two binding posts of the electric detonator 33 are independent, and the falling detection control module is connected with the electric detonator.

Fig. 2 is a schematic structural view of a lancet mechanism of the gas generator provided by the present invention. The lancet mechanism 36 includes a lancet 361 and a moving portion 362 attached to the rear of the lancet 361, the moving portion having a diameter that ensures that the lancet mechanism slides within the cavity of the valve body. When the electric detonator is excited, one end of the moving part bears the impact of high-pressure gas to drive the pricking pin to move. As shown in FIG. 3, spike 361 has a sharp angle a of 60 to 80, preferably 70, to ensure the fastest puncture of the mouth of compressed gas cylinder 38.

Fig. 4 to 6 are schematic diagrams showing the movement process of the puncture needle mechanism after the electric squib of the gas generator provided by the invention is excited. In the initial state, the needle 361 of the needle mechanism 36 is aligned with the mouth of the compressed gas cylinder 38 and slightly contacts (as shown in fig. 4). When the gas generator receives the early warning signal sent by the fall detection control module, the energy of the electric squib 33 is excited, high pressure is established in the upper high-pressure cavity 371, the high-pressure gas pushes the puncture needle mechanism 36 to move downwards to puncture the opening of the compressed gas cylinder 38, and meanwhile, the moving part 362 blocks the opening of the compressed gas cylinder 38 (as shown in fig. 5). The vent hole 373 communicates with the upper high-pressure chamber 371, and the high pressure established in the upper high-pressure chamber 371 is released through the vent hole 373, and the pressure in the upper high-pressure chamber 371 decreases. The air pressure in the compressed air cylinder 38 pushes the spike mechanism 36 upward, pushing the spike mechanism 36 into the upper high pressure chamber 371 of the valve body 37 (as shown in FIG. 6). Meanwhile, as the moving part 362 blocks the opening of the compressed gas cylinder 38, the internal pressure of the compressed gas cylinder 38 can generate larger reverse thrust to the puncturing mechanism, so that the puncturing mechanism can move reversely for a longer distance, the opening of the compressed gas cylinder 38 is empty, the gas can be released quickly, and the gas overflows from the vent hole 373 on the periphery of the lower exhaust cavity 372.

The gas in the compressed gas cylinder 38 is at least one of carbon dioxide and nitrogen, and a certain amount of helium can be filled together to be used as a tracer element to judge and check the leakage rate of the compressed gas cylinder. Preferably, carbon dioxide and helium are used inside the compressed gas cylinder. At low temperature, helium brings out part of carbon dioxide from the compressed gas cylinder, carbon dioxide absorbs heat from surrounding air, so that the gasification time of carbon dioxide can be shortened, the low-temperature exhaust time of the gas generator is ensured to be within 150ms, and meanwhile, helium can be used for detecting the leakage rate of the compressed gas cylinder.

Specifically, the squib 33 is mounted in the bonnet 31 by means of a squib compression ring 34 provided in the bonnet 31, and is prevented from moving. A first sealing ring 39 is arranged between the electric explosion tube 33 and the valve cover 31, and a second sealing ring 35 is arranged between the puncture needle mechanism 36 and the valve body 37, so that the upper high-pressure cavity 371 of the valve body 37 is sealed. When the electric explosion tube is excited and the pricking pin mechanism moves downwards, the pricking pin mechanism is separated from the second sealing ring, so that the upper high-pressure cavity is communicated with the exhaust hole to release high-pressure gas. The process of the electric detonator excitation is carried out in the upper high-pressure cavity, and due to the matching of the first sealing ring and the second sealing ring, the sound generated during the triggering process is sealed in the cavity, so that the whole triggering process is ensured not to generate violent sound and the reactant is leaked.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not used to limit the scope of the present invention. However, all equivalent changes and modifications made within the scope of the present invention should be considered as falling within the scope of the present invention.

Claims

1. A gas generator, characterized in that it comprises:

the valve body (37) is internally provided with a cavity, the cavity comprises an upper high-pressure cavity (371) and a lower exhaust cavity (372) which are communicated with each other, and the lower exhaust cavity (372) is provided with a puncture needle mechanism (36);

a valve cover (31) connected to the upper end of the valve body (37), the interior of the valve cover being communicated with the upper high-pressure chamber (371); an electric explosion tube (33) is arranged in the valve cover (31); and

and a compressed gas cylinder (38) connected to the lower end of the valve body (37).

2. A gas generator according to claim 1, characterized in that the short circuit ring seat (32) is arranged on the top of the valve cover (31), and the short circuit ring seat (32) is connected with the electric detonator (33).

3. A gas generator according to claim 1 or 2, characterized in that the lower discharge chamber (372) of the valve body (37) is partially provided with a discharge hole (373) communicating with the outside.

4. A gas generator according to claim 1 or 2, characterised in that the gas in the compressed gas cylinder (38) comprises at least one of carbon dioxide and nitrogen.

5. A gas generator according to claim 4, characterized in that the gas in the compressed gas cylinder (38) also comprises helium.

6. A gas generator according to claim 1 or 2, wherein the squib (33) is mounted in the valve cap (31) by means of a squib collar (34) provided in the valve cap (31).

7. A gas generator according to claim 1 or 2, characterized in that a first sealing ring (39) is provided between the squib (33) and the valve cover (31).

8. A gas generator according to claim 1 or 2, wherein a second sealing ring (35) is arranged between the needle mechanism (36) and the valve body (37).

9. A gas generator according to claim 1 or 2, wherein the lancet mechanism (36) comprises a lancet (361) and a moving part (362) connected to the rear of the lancet (361).

10. A gas generator according to claim 9, wherein the spike (361) has a sharp angle (a) of 60 ° -80 °.

11. A gas generator according to claim 10, characterised in that said sharp angle (a) is 70 °.