Gas generator, safety airbag and vehicle

Abstract

The utility model relates to the technical field of safety air bags, and discloses a gas generator, a safety air bag and a vehicle, the gas generator comprises a generator shell, a containing cavity is formed in the generator shell, and an exhaust hole is formed in the generator shell; an ignition unit; the filter is arranged in the accommodating cavity; and the edge of the flanging end cover is provided with a flanging part, the flanging part is connected with the filter, the filter is further connected with the inner wall of the generator shell so that the containing cavity can be divided into a gas production chemical containing cavity and a purified gas circulation cavity through the filter and the flanging end cover, the ignition unit is arranged in the gas production chemical containing cavity, and the exhaust hole is communicated with the purified gas circulation cavity. According to the gas generator, the situation that the airbag cloth is burnt by high-temperature disintegrating slag generated by the gas generating medicine, so that the safety airbag is difficult to play an effective protection role can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of safety airbags, in particular to a gas generator, and further to a safety airbag and a vehicle. Background Art

[0002] Airbag is a passive safety protection system in vehicles.

[0003] An airbag generally includes a gas generating device and an airbag cloth connected to it. The gas generating device is generally filled with gunpowder and gas generating powder. When a car collides, the electronic ignition device will ignite the gunpowder, and the gunpowder will drive the gas generating powder to produce a large amount of gas in a short time to fill the airbag cloth and realize the popping out of the airbag.

[0004] During the gas generating process, the gas generating agent itself will break into fragments, and under the action of gas pressure, it is easy to leak from the gas generating device, which can easily burn the airbag cloth, making it difficult for the airbag to play an effective protective role.

[0005] Therefore, it is necessary to design a new type of gas generator to solve the above-mentioned technical problems. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a gas generator, which can solve the problem that the high-temperature debris generated by the gas-generating medicine burns the airbag cloth, making it difficult for the safety airbag to play an effective protective role.

[0007] In order to solve the above technical problems, the utility model provides a gas generator in a first aspect, comprising:

[0008] A generator housing, wherein a receiving cavity is formed in the generator housing, and an exhaust hole is provided on the generator housing;

[0009] Ignition unit;

[0010] A filter, wherein the filter is disposed in the accommodating cavity;

[0011] And a flanged end cover, the edge of the flanged end cover is provided with a flanged portion, the flanged end cover is connected to the filter through the flanged portion, the filter and the flanged end cover divide the accommodating chamber into a gas generating agent accommodating chamber and a clean air flow chamber, the ignition unit is arranged in the gas generating agent accommodating chamber, and the exhaust hole is connected to the clean air flow chamber.

[0012] Further, the generator housing includes a first housing and a second housing, the first housing can be connected to the second housing to form the accommodating cavity, the exhaust hole is opened on the first housing, and the ignition unit is connected to the second housing.

[0013] Furthermore, the ignition unit is arranged in the middle of the gas generating agent containing chamber, and the ignition unit includes an ignition device and an ignition powder box. The ignition powder box is provided with ignition powder, and the ignition device can ignite the ignition powder to ignite the gas generating agent in the gas generating agent containing chamber.

[0014] Furthermore, the ignition device is fixedly connected to the second shell, and a primer hole is provided at the portion where the ignition device is connected to the ignition powder box.

[0015] Furthermore, a fixed base is provided on the second shell, one end of the ignition powder box is connected to the fixed base, and the other end of the ignition powder box is abutted against the flanged end cover.

[0016] Furthermore, a powder chamber suitable for accommodating the ignition powder is formed in the ignition powder box, and the end surface of the ignition powder box at one end away from the fixed base is recessed inward to form a recessed portion, and the recessed portion does not contact the side wall of the ignition powder box.

[0017] Furthermore, an ignition fire hole is provided on the side wall of the ignition powder box.

[0018] Furthermore, the flange portion includes:

[0019] Hemming,

[0020] The edges of the flanged end caps are connected, and the edge wrapping extends obliquely in a direction away from the cover surface of the flanged end caps;

[0021] and a snap-fit ​​edge, the snap-fit ​​edge being connected to a side of the edge covering away from the cover surface, the snap-fit ​​edge extending toward the cover surface, and in the direction approaching the cover surface, the snap-fit ​​edge being inclined toward a direction away from the center of the cover surface;

[0022] The filter is provided with a clamping groove, and the clamping edge is clamped in the clamping groove.

[0023] Furthermore, a deformation portion is formed at a connection between the clamping edge and the edge covering, and the clamping edge can be tilted toward or away from the edge covering through deformation of the deformation portion.

[0024] A second aspect of the utility model provides an airbag, comprising:

[0025] The gas generator in the above technical solution comprises the generator housing, and a connecting ring is provided on the outer wall of the generator housing;

[0026] and an airbag cloth connected to the connecting ring.

[0027] A third aspect of the utility model provides a vehicle, which includes the safety airbag in the above technical solution.

[0028] Through the above technical solution, the beneficial effects of the utility model are as follows:

[0029] The first aspect of the utility model provides a gas generator, including a generator shell and a filter, a flanged end cover and an ignition unit placed in a accommodating chamber formed by the generator shell, wherein an exhaust hole is provided on the generator shell, and the filter and the flanged end cover divide the accommodating chamber into a gas generating agent accommodating chamber and a clean gas flow chamber, so that the gas generating agent in the gas generating agent accommodating chamber can be filtered by the filter during the high-temperature reaction to generate gas, and the flanged end cover has a blocking effect, so that the high-temperature debris generated by the gas generating agent in the excessively long gas generation is not easy to leak from the gas generating agent accommodating chamber. Therefore, it is not easy for the high-temperature debris to be discharged from the exhaust hole to the outside along with the generated high-pressure gas to injure the airbag cloth, making it difficult for the safety airbag to play an effective protective role.

[0030] The second aspect of the utility model provides a safety airbag. Since the safety airbag has the above-mentioned gas generator, it also has the advantages of being not easily damaged and being able to play an effective protective role.

[0031] The third aspect of the utility model provides a vehicle. Since the vehicle has the above-mentioned safety airbag, it has good safety performance and can provide good protection for the driver and passengers.

[0032] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0034] Figure 1 It is a cross-sectional view of the gas generator of the utility model cut along the longitudinal direction;

[0035] Figure 2 It is a schematic diagram of the overall structure of the flanged end cover in the gas generator of the utility model;

[0036] Figure 3 The flanged end cover of the gas generator of the utility model is Figure 1 Magnified view of area A.

[0037] Description of Reference Numerals

[0038] 1. Generator housing 11. Exhaust hole

[0039] 12. First shell 13. Second shell

[0040] 131, fixed base 14, connecting ring

[0041] 2. Ignition unit 21. Ignition tool

[0042] 22. Ignition powder box 221. Ignition fire hole

[0043] 3. Filter 4. Flanged end cap

[0044] 41. Flanging 411. Edge wrapping

[0045] 412, card edge 42, cover

[0046] 43. Deformation part 5. Gas generating agent containing chamber DETAILED DESCRIPTION

[0047] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to illustrate and explain the present invention, and the protection scope of the present invention is not limited to the specific implementation modes described below.

[0048] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "provided with", "installed", "matched", and "connected" should be understood in a broad sense. For example, the connection can be a direct connection or an indirect connection through an intermediate medium, a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connector, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0050] In the present invention, unless otherwise specified, the directional words used, such as "inside and outside", are defined as the inside and outside of the corresponding parts, and the "axis" is defined as the arrangement direction of each air outlet provided by the present invention. Specifically, in the drawings provided by the present invention, the orientation or position relationship used is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; the orientation terms of the present invention should be understood in conjunction with the actual installation state.

[0051] See also Figures 1 to 3 The utility model provides a gas generator in a first aspect, including a generator housing 1, a housing cavity formed in the generator housing 1, and an exhaust hole 11 is provided on the generator housing 1, an ignition unit 2, a filter 3, the filter 3 is arranged in the housing cavity, a flanged end cover 4, an edge of the flanged end cover 4 is provided with a flanged portion 41, the flanged portion 41 can be connected to the filter 3, the filter 3 and the flanged end cover 4 divide the housing cavity into a gas generating agent housing cavity 5 suitable for accommodating a gas generating agent and a clean gas flow cavity (wherein the gas generating agent is a prior art and will not be described in detail here), and the ignition unit 2 is arranged In the gas generating agent containing chamber 5, the exhaust hole 11 is connected with the clean gas circulation chamber, so that it can be ignited by the ignition unit 2 to ignite the gas generating agent so that the gas generating agent reacts to produce gas. The gas produced by the gas generating agent can be filtered by the filter 3 and stopped by the flanged end cover 4, so that during the long period of gas generation, the high-temperature debris produced by the gas generating agent is not easy to leak from the gas generating agent containing chamber 5. Therefore, it is not easy for the high-temperature debris to be discharged from the clean gas circulation chamber and the exhaust hole 11 to the outside along with the generated high-pressure gas to injure the airbag cloth, making it difficult for the safety airbag to play an effective protective role.

[0052] Furthermore, the generator housing 1 can be configured to include a first housing 12 and a second housing 13. The first housing 12 can be connected to the second housing 13 to form a accommodating chamber. An exhaust hole 11 is provided on the first housing 12 to ensure that the produced gas can enter the airbag cloth from the exhaust hole 11 to realize the ejection of the airbag. The ignition unit 2 is connected to the second housing 13 to ensure that the ignition unit 2 is sufficiently far from the exhaust hole 11, thereby ensuring that the flame during ignition is not easy to enter the airbag from the exhaust hole 11, thereby reducing the possibility of the airbag being burned. When installing the gas generator of the utility model, the ignition unit 2 and the filter 3 can be connected to the first housing 12 or the second housing 13, and then the gas generating agent can be filled between the ignition unit 2 and the filter 3. After the gas generating agent is filled, the flanged end cover 4 and The filter 3 is connected to seal the gas generating agent in the gas generating agent containing chamber 5, and finally the first shell 12 and the second shell 13 are connected to form a gas generator. Since the gas generating agent will generate a large amount of gas in a short time, the generated gas pressure is relatively large. In order to ensure that the gas generator is not easily damaged or cracked during the gas generation process, the first shell 12 and the second shell 13 can be integrally stamped into a barrel-shaped structure with a cylindrical cavity space using a metal material (such as steel), and an arc-shaped chamfered structure should be adopted between the bottom wall and the side wall of the barrel-shaped structure to avoid stress concentration at the connection between the bottom wall and the side wall, which is easy to rupture. The first shell 12 and the second shell 13 can be connected by friction welding to ensure the firmness of the welding and prevent the generator shell 1 from cracking.

[0053] Furthermore, the ignition unit 2 can be arranged in the middle of the gas generating agent containing chamber 5, so that the distances between the ignition unit 2 and the filter 3 at various locations are basically consistent, so that the distribution of the gas generating agent can be more uniform, so that the gas pressure inside the gas generator during gas production can be more stable. Specifically, the ignition unit 2 includes an ignition device 21, in which a primer is provided, and the ignition device 21 is connected to a power supply so that the ignition device 21 can be controlled by an electrical signal for ignition (the prior art is not repeated here), and the ignition device 21 can be fixedly connected to the first shell 12 or the second shell 13 through an injection molding process; the ignition unit 2 also includes an ignition gunpowder box 22, in which ignition gunpowder can be filled, the ignition gunpowder box 22 is connected to the ignition device 21, and after the ignition device 21 is ignited, the ignition gunpowder can ignite the gas generating agent in the gas generating agent containing chamber 5. Specifically For example, taking the connection between the ignition device 21 and the second shell 13 as an example, a fixing seat can be set in the middle of the second shell 13, such as a cylindrical fixing seat and can be injection molded in the middle of the second shell 13, and the ignition gunpowder box 22 can be set as a cylindrical structure. The inside of the cylindrical structure of the ignition gunpowder box 22 is formed with a gunpowder chamber suitable for accommodating ignition gunpowder, and the ignition gunpowder box 22 can achieve the clamping connection between the ignition gunpowder box 22 and the fixing seat by the interference fit between its own inner wall and the outer wall of the fixing seat. Of course, it can be understood that the part where the ignition device 21 is connected to the ignition gunpowder box 22 needs to be provided with a primer fire hole so that the primer can enter the ignition gunpowder box 22 from the primer fire hole to ignite the gunpowder in the ignition gunpowder box 22, and the side wall of the ignition gunpowder box 22 is provided with an ignition fire hole 221, so that the flame can enter the gas generating powder containing cavity 5 from the ignition fire hole 221 to ignite the gas generating powder.

[0054] Furthermore, the end of the ignition powder box 22 away from the fixing seat can be arranged to abut against the flanged end cover 4, so as to ensure that the pressure generated by the rapid combustion of the gunpowder in the ignition powder box 22 can be borne by the flanged end cover 4, so as to ensure that the ignition powder box 22 is not easy to fall off from the fixing seat, so as to ensure that the gunpowder can better penetrate into the gas generating agent containing chamber 5 when it is ejected from the ignition fire hole 221, so as to ignite more gas generating agents at the same time, so that less time is spent on generating sufficient gas. In addition, it can be understood that the ignition powder box 22 The end surface of the end away from the fixed base 131 can be arranged to be recessed into the interior of the gunpowder chamber to form a recessed portion, and gas-producing powder can also be filled between the recessed portion and the flanged end cover 4. An ignition fire hole 221 is also provided on the recessed portion, and the recessed portion does not contact the side wall of the ignition gunpowder box 22, so that the cylindrical ignition gunpowder box 22 can have a larger diameter when holding the same amount of ignition gunpowder, so as to expand the contact area with the gas-producing powder, ignite more gas-producing powder at the same time, and make the gas production speed faster.

[0055] Further, the filter 3 can be set as a circular tube structure, the flanged end cover 4 can be set as a circle, and the flanged portion 41 of the flanged end cover 4 can be set to include a rim 411 and a clamping edge 412, the rim 411 is connected to the edge of the flanged end cover 4, and the rim 411 extends obliquely in a direction away from the cover surface 42 of the flanged end cover 4, the clamping edge 412 is connected to a side of the rim 411 away from the cover surface 42, and the clamping edge 412 extends in a direction close to the cover surface 42, and close to the cover surface 42, the clamping edge 412 is inclined in the direction away from the center of the cover surface 42, and a clamping groove 31 is correspondingly provided on the inner wall of the filter 3, and the clamping groove 31 can accommodate the clamping edge 412. The connection between the clamping edge 412 and the edge 411 forms a deformation portion 43, and the clamping edge 412 can be tilted in the direction close to or away from the edge 411 through the deformation of the deformation portion 43. During the installation process, the flange portion 41 can be pressed in a way that the flange portion 41 is first moved close to the cover surface 42. The clamping edge 412 is preferably arranged in a direction away from the center of the filter 3, until the clamping edge 412 is clamped into the clamping groove 31, so that the flange portion 41 and the filter 3 are clamped by interference fit, and in the process of gas production by the gas producing agent, when the flange end cover 4 is subjected to the pressure of the produced gas, the flange end cover 4 will move in the direction away from the ignition powder box 22 under the action of the gas pressure, so as to achieve a certain pressure relief effect, and can reduce the situation where the filter 3 is broken due to high pressure and the filtering effect is weakened or the filtering effect is lost, and in the process of movement, the clamping edge 412 can be inclined in the direction away from the edge 411, so as to ensure that the clamping edge 412 is always clamped in the clamping groove 31, so as to ensure that the flange end cover 4 is not easy to fall out of the filter 3 and the connection between the flange end cover 4 and the filter 3 is not easy to have a gap, so that the residue after the combustion of the gas producing agent is not easy to leak from the upper end of the filter 3, and the flange end cover 4 can be specifically made of DC06 cold-rolled low-carbon steel with excellent deep drawing performance and integrally stamped.

[0056] A safety airbag provided in the second aspect of the utility model includes the gas generator and airbag cloth in the above-mentioned technical solution, and a connecting ring 14 is provided on the outer wall of the generator shell 1 of the gas generator, and the airbag cloth can be connected to the connecting ring 14. Taking the above-mentioned generator shell 1 including the first shell 12 and the second shell 13, and the ignition device 21 is connected to the second shell 13 as an example, the airbag cloth can be set to be able to cover the first shell 12, and only the exhaust hole 11 needs to be set on the first shell 12 to ensure that the produced gas can enter the airbag cloth from the exhaust hole 11 to realize the popping out of the safety airbag. Since the safety airbag has the above-mentioned gas generator, it also has the advantages of not being easily damaged and being able to play an effective protective role.

[0057] Furthermore, a vehicle provided by the third aspect of the utility model includes the airbag in the above technical solution, so the vehicle has good safety performance and can provide good protection for the driver and passengers. The preferred embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above embodiments. Within the technical concept of the utility model, the technical solution of the utility model can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the utility model.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0059] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A gas generator, characterized in that: include: A generator housing (1), wherein a receiving cavity is formed in the generator housing (1), and an exhaust hole (11) is provided on the generator housing (1); Ignition unit (2); A filter (3), wherein the filter (3) is arranged in the accommodating cavity; and a flanged end cover (4), wherein the edge of the flanged end cover (4) is provided with a flanged portion (41), the flanged end cover (4) is connected to the filter (3) via the flanged portion (41), the filter (3) and the flanged end cover (4) divide the accommodating chamber into a gas generating agent accommodating chamber (5) and a clean air flow chamber, the ignition unit (2) is arranged in the gas generating agent accommodating chamber (5), and the exhaust hole (11) is connected to the clean air flow chamber.

2. The gas generator according to claim 1, characterized in that The generator housing (1) comprises a first housing (12) and a second housing (13); the first housing (12) can be connected to the second housing (13) to form the accommodating chamber; the first housing (12) is provided with the exhaust hole (11); and the ignition unit (2) is connected to the second housing (13).

3. The gas generator according to claim 2, characterized in that The ignition unit (2) is arranged in the middle of the gas generating agent containing chamber (5), and the ignition unit (2) comprises an ignition device (21) and an ignition powder box (22). The ignition powder box (22) contains ignition powder, and the ignition device (21) can ignite the ignition powder to ignite the gas generating agent in the gas generating agent containing chamber (5).

4. The gas generator according to claim 3, characterized in that The igniter (21) is fixedly connected to the second housing (13), and a primer through-hole is provided at the portion where the igniter (21) is connected to the ignition powder box (22).

5. The gas generator according to claim 3, characterized in that The second shell (13) is provided with a fixed base (131), one end of the ignition powder box (22) is connected to the fixed base (131), and the other end of the ignition powder box (22) is in contact with the flanged end cover (4).

6. The gas generator according to claim 5, characterized in that A powder chamber suitable for accommodating the ignition powder is formed in the ignition powder box (22), and an end surface of the ignition powder box (22) away from the fixed base (131) is recessed inward to form a recessed portion, and the recessed portion does not contact the side wall of the ignition powder box (22).

7. The gas generator according to claim 6, characterized in that An ignition fire hole (221) is provided on the side wall of the ignition powder box (22).

8. The gas generator according to any one of claims 2 to 7, characterized in that: The flange portion (41) comprises: An edge (411), the edge (411) being connected to an edge of the flanged end cover (4), and the edge (411) extending obliquely in a direction away from the cover surface (42) of the flanged end cover (4); and a snap-fit ​​edge (412), the snap-fit ​​edge (412) being connected to a side of the edge (411) away from the cover surface (42), the snap-fit ​​edge (412) extending in a direction approaching the cover surface (42), and in a direction approaching the cover surface (42), the snap-fit ​​edge (412) being inclined in a direction away from the center of the cover surface (42); The filter (3) is provided with a snap-fit ​​groove, and the snap-fit ​​edge (412) is snap-fitted into the snap-fit ​​groove.

9. The gas generator according to claim 8, characterized in that A deformation portion (43) is formed at the connection between the clamping edge (412) and the edge covering (411), and the clamping edge (412) can be tilted in a direction approaching or away from the edge covering (411) through the deformation of the deformation portion (43).

10. A safety airbag, characterized in that: include: The gas generator according to any one of claims 1 to 9, comprising the generator housing (1), wherein a connecting ring (14) is provided on an outer wall of the generator housing (1); and an airbag cloth, wherein the airbag cloth is connected to the connecting ring (14).

11. A vehicle, characterized in that: Includes the airbag as claimed in claim 10.

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