Mixed type miniature gas generator for child seat

Abstract

The utility model discloses a mixed type miniature gas generator for a child seat, and aims to provide the mixed type miniature gas generator for the child seat, which is used for improving the use safety. An inner cavity of the tube body is arranged to be a mixed gas cavity, the ignition sleeve is connected with a cavity opening in one end of the mixed gas cavity in an inserted mode, the diffuser is connected with a cavity opening in the other end of the tube body, the diffuser is provided with a gas accelerating cavity, the cavity opening of the tube body is connected with a blasting membrane, and the blasting membrane isolates the mixed gas cavity and the gas accelerating cavity. One end in the ignition sleeve is connected with an igniter and gunpowder, and the other end in the ignition sleeve is connected with a shunt filter cup and an end cover. The beneficial effects of the utility model are that the air generator uniformly pressurizes and inflates the air bag at a high speed; the temperature of discharged gas is reduced to prevent scalding; the use safety of children is improved; the structure is compact and production cost is saved; the structural connection stability is improved; the sealing performance of the generator is ensured; and the inflation speed is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gas generators, in particular to a hybrid micro gas generator used for a child seat. Background Art

[0002] The automobile airbag module consists of a gas generator and an inflatable nylon bag. When the car collides and sends an ignition signal, the gas generator will be instantly ignited and produce a large amount of gas. The large amount of gas generated by the combustion of the gas generating agent or by other means is discharged into the airbag through the exhaust holes distributed in a circle on the gas generator shell, causing the airbag to expand, thereby protecting the occupants including young children in child seats from harm. Since the gas generator is the core component of the automobile airbag module, as the popularity of automobile airbags continues to increase, the requirements for the performance, reliability and price of the gas generator are also getting higher and higher.

[0003] China Patent Authorization Announcement Number: CN 217864029 U, Authorization Announcement Date November 22, 2022, This utility model relates to a tubular hybrid gas generator for automobile airbags, including a micro gas generator, a steel pipe and an exhaust assembly. The micro gas generator, the exhaust assembly and the left and right sides of the steel pipe are sealed and connected to form a closed container. The hollow cavity of the steel pipe is a mixed gas accommodating chamber. A plug is provided on the side wall of the steel pipe. The right port of the mixed gas accommodating chamber is sealed and isolated from the exhaust assembly by a bursting disc. The shortcomings of this technical solution are: 1. The airflow path from the tube shell to the exhaust assembly is almost directly discharged radially, the temperature is too high and the pressure is limited, which affects the safety of use, especially for children. Reduced safety of airbags; 2. The gas directly enters the mixed gas accommodating chamber from the tube shell, resulting in the contact uniformity of the high-temperature gas and the mixed gas being affected, resulting in poor pressurization effect. In addition, the burning gunpowder residue and the blasting debris affect the gas discharge effect, further affecting the safety of use.

[0004] In summary: the gas generator has the disadvantage of poor safety in use. Utility Model Content

[0005] The utility model aims to overcome the disadvantage of poor use safety of gas generators in the prior art and provides a hybrid micro gas generator for a child seat with improved use safety.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A hybrid micro gas generator for a child seat comprises an ignition sleeve, a tube body and a diffuser. The inner cavity of the tube body is set as a mixed gas cavity, in which a mixed gas consisting of argon and helium is encapsulated. The ignition sleeve is plugged into a cavity opening at one end of the mixed gas cavity, and the diffuser is connected to a cavity opening at the other end of the tube body. The diffuser is provided with a gas acceleration cavity, and a bursting membrane is connected to the cavity opening of the tube body, which isolates the mixed gas cavity from the gas acceleration cavity. An igniter and gunpowder are connected to one end of the ignition sleeve, and a diversion filter cup and an end cover are connected to the other end of the ignition sleeve.

[0008] The tube body is a grout-like structure with openings at both ends, and the ignition sleeve is plugged and fixedly connected to the opening at one end of the tube body, so that one end of the ignition sleeve enters the mixed gas cavity, and one end of the ignition sleeve where the ignition device is installed is exposed outside the tube body and connected to the external ignition system, and the gunpowder, the shunt filter cup and the end cover are sequentially arranged at the other end of the ignition sleeve to make the arrangement more compact; the ignition device is used to ignite the gunpowder, and the high-temperature and high-pressure gas guided after the combustion residue is filtered through the shunt filter cup evenly and quickly breaks through the end cover, and then pressurizes the mixed gas composed of argon and helium inert gases in the mixed gas cavity, and the pressurized mixed gas flows toward the other end of the tube body and breaks through the sealing bursting membrane, so that the gas enters the gas acceleration cavity; the gas acceleration cavity is the inner wall structure of the diffuser The airbag is compressed and accelerated to be ejected from the diffuser to inflate the airbag quickly, while preventing direct discharge to reduce the outlet temperature and increase the pressure-maintaining effect. For the safety airbag of the child seat, the safety performance is further improved by cooperating with a child seat with safety protection. In view of the limited size of the protective space in the car and the size required by the child, the hybrid gas generator in the airbag at its position has a compact miniature body through the above structure, realizing a streamlined structure while ensuring smooth and fast inflation, and cooperating with the reduction of temperature to better and effectively protect the safety of children, improve safety and reduce production costs. The airbag is pressurized and inflated evenly and quickly, the temperature of the discharged gas is reduced to prevent burns, the safety of children is improved, and the compact structure saves production costs.

[0009] Preferably, the inner wall of the ignition sleeve is provided with a limiting boss, the structure of the diversion filter cup is a semicircular cavity structure, the cup mouth of the diversion filter cup is clamped with the limiting boss, the protruding end of the diversion filter cup is arranged opposite to the ignition device and is provided with a plurality of guide holes, and the guide holes are evenly arranged on the diversion filter cup. The inner wall of the ignition sleeve is provided with a limiting boss structure in an L-shaped structure, and the diversion filter cup with a bowl-shaped structure of a limiting semicircular cavity structure enables the diversion plate to be clamped at the limiting boss, and cannot move itself under the impact of the airflow, but only allows the airflow to pass through each guide hole stably. The semicircular bowl-shaped arc surface of the diversion filter cup allows more residue to be gathered at the limiting boss, thereby reducing discharge from the guide hole, and at the same time, the airflow is evenly distributed through the uniform diversion holes. The effect of improving the stability of the structural connection, ensuring the uniformity of the airflow to achieve uniform pressurization, and preventing waste residue from flying out to improve safety is achieved.

[0010] Preferably, the ignition sleeve is provided with a connection boss, and the ignition sleeve is connected to the tube body through the connection boss. There is a gap between the end of the ignition sleeve inserted into the tube body and the inner wall of the tube body and is set as a flow channel, and the flow channel is connected to the mixed gas cavity. The ignition sleeve is fixedly connected to the port of the tube body through the protruding connection boss, and the end of the ignition sleeve inserted into the tube body is separated from the tube body by a protective distance, thereby increasing the pressurization space and volume of the high-temperature and high-pressure gas and the inert gas after breaking through the end cover, and further reducing the temperature. The effect of improving the stability of the structural connection, ensuring the pressurization and improving the cooling effect is achieved.

[0011] Preferably, the diffuser includes a connecting seat and a gas outlet, one end of the connecting seat is connected to the tube body, the other end of the connecting seat is connected to the gas outlet, the gas outlet is provided with a gas outlet cavity, the gas outlet cavity is provided with gas outlet holes, a plurality of gas outlet holes are provided and evenly arranged on the gas outlet, one end of the gas acceleration cavity is connected to the mixed gas cavity, and the other end of the gas acceleration cavity is connected to the gas outlet cavity. The diffuser includes a connecting seat and a gas outlet and they are connected as an integrated structure, the connecting seat is fixed to the tube body, and the gas outlet is used to quickly inflate the airbag by allowing the pressurized gas to enter the gas outlet cavity and diffuse evenly from all sides of the gas outlet holes. The effect of improving the stability of the structural connection, improving the rapid and uniform inflation of the gas, and thus enhancing the safety of children's use is achieved.

[0012] Preferably, the gas acceleration chamber includes a transition chamber and a compression chamber, the transition chamber has a semi-elliptical structure, the bursting membrane is sealed and connected to the larger diameter end of the transition chamber, the smaller diameter end of the transition chamber has the same diameter as the compression chamber and is connected, and the inner diameter of the outlet chamber is larger than the diameter of the compression chamber. The gas acceleration chamber includes a transition chamber and a compression chamber, the transition chamber has a semi-elliptical structure to prevent the bursting membrane from breaking through and blocking the opening connecting the transition chamber and the compression chamber, the caliber from the semi-ellipse to the compression chamber gradually decreases to further pressurize the gas, so that the gas rushing out of the compression chamber is accelerated and then enters the outlet chamber for release. This ensures the inflation speed and timely opens the airbag to achieve safety protection.

[0013] Preferably, the tube body is provided with a through hole, which is connected to the mixed gas chamber, and the through hole is sealed with a block. The tube body is provided with a through hole to add the mixed gas, and the block is used to seal to prevent gas leakage, so as to ensure the sealing of the generator.

[0014] The beneficial effects of the utility model are: the gas generator pressurizes and inflates the airbag evenly and at a high speed; reduces the temperature of the discharged gas to prevent burns; improves the safety of children's use; has a simple and compact structure to save production costs; improves the stability of the structural connection; ensures the sealing of the generator; ensures the inflation speed and timely opens the airbag to achieve safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 is a cross-sectional view of the connection between the split filter cup and the ignition sleeve;

[0017] Figure 3 is a cross-sectional view of the diffuser.

[0018] In the figure: 1. ignition sleeve, 2. tube body, 3. diffuser, 4. mixed gas chamber, 5. gas acceleration chamber, 6. bursting membrane, 7. ignition device, 8. gunpowder, 9. diversion filter cup, 10. end cover, 11. limiting boss, 12. guide hole, 13. connecting boss, 14. circulation channel, 15. connecting seat, 16. air outlet tube, 17. air outlet chamber, 18. air outlet hole, 19. transition chamber, 20. compression chamber, 21. through hole, 22. block, 23. sealing ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specified, the relative arrangement of the components, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present application. For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right" are used in the embodiments to illustrate the relationship between an element or feature shown in the figure and another element or feature. It should be understood that, in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "on" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or located in other orientations), and the spatial relative description used here can be interpreted accordingly. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, process and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, process and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values.It should be noted that similar reference numerals and letters denote similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0023] Embodiment 1:

[0024] like Figure 1 As shown, a hybrid micro gas generator for a child seat comprises an ignition sleeve 1, a tube body 2 and a diffuser 3. The inner cavity of the tube body 2 is set as a mixed gas cavity 4, and a mixed gas composed of argon and helium is encapsulated in the mixed gas cavity 4. The ignition sleeve 1 is plugged into one end of the mixed gas cavity 4, and the diffuser 3 is connected to the other end of the tube body 2. The diffuser 3 is provided with a gas acceleration cavity 5, and the cavity of the tube body 2 is connected with a bursting membrane 6, which isolates the mixed gas cavity 4 from the gas acceleration cavity 5. An igniter 7 and gunpowder 8 are connected to one end of the ignition sleeve 1, and a diversion filter cup 9 and an end cover 10 are connected to the other end of the ignition sleeve 1. The tube body 2 is provided with a through hole 21, which is connected to the mixed gas cavity 4, and a blocking block 22 is sealed and connected to the through hole 21.

[0025] like Figure 1 , 2 As shown, the inner wall of the ignition sleeve 1 is provided with a limiting boss 11, the structural shape of the diverter filter cup 9 is a semicircular cavity structure, the cup mouth end of the diverter filter cup 9 is snap-connected with the limiting boss 11, the protruding end of the diverter filter cup 9 is arranged opposite to the ignition device 7 and is provided with a plurality of guide holes 12, and the guide holes 12 are evenly arranged on the diverter filter cup 9.

[0026] like Figure 1 As shown, the ignition sleeve 1 is provided with a connecting boss 13, and the ignition sleeve 1 is connected to the tube body 2 via the connecting boss 13. There is a gap between one end of the ignition sleeve 1 inserted into the tube body 2 and the inner wall of the tube body 2 and is provided as a flow channel 14, and the flow channel 14 is connected to the mixed gas chamber 4.

[0027] like Figure 1 , 3 As shown, the diffuser 3 includes a connecting seat 15 and an air outlet tube 16, one end of the connecting seat 15 is connected to the tube body 2, and the other end of the connecting seat 15 is connected to the air outlet tube 16, the air outlet tube 16 is provided with an air outlet cavity 17, the air outlet cavity 17 is provided with an air outlet hole 18, a plurality of air outlet holes 18 are provided and are evenly arranged on the air outlet tube 16, one end of the gas acceleration cavity 5 is connected to the mixed gas cavity 4, and the other end of the gas acceleration cavity 5 is connected to the air outlet cavity 17.

[0028] like Figure 3 As shown, the gas acceleration chamber 5 includes a transition chamber 19 and a compression chamber 20. The structural shape of the transition chamber 19 is a semi-elliptical structure. The bursting membrane 6 is sealed and connected to the cavity opening at the larger diameter end of the transition chamber 19. The cavity opening at the smaller diameter end of the transition chamber 19 has the same diameter as the compression chamber 20 and is connected. The inner cavity diameter of the air outlet chamber 17 is larger than the diameter of the compression chamber 20.

[0029] like Figure 1-3 As shown: the connection between the ignition sleeve 1, the tube body 2 and the diffuser is fixed together by welding to prevent the structures from being separated after ignition, resulting in insufficient internal airtightness and affecting inflation.

[0030] The ignition device 7 is fixedly connected to the inner wall of the ignition sleeve 1, and the ignition device 7 is sleeved with a sealing ring 23, which is tightly attached to the inner wall of the ignition sleeve 1 to ensure the internal airtightness of the body generator. The ignition device 7 is externally connected to an ignition signal to control the inflation operation of the airbag.

[0031] The gas mixing ratio of argon and helium is 99:1, which reduces the outlet temperature and increases the pressure holding effect, can better and more effectively protect the safety of children and improve safety. At the same time, the mixing ratio is cost-effective and can better meet market demand.

[0032] When the gas generator is used to inflate the airbag: the igniter 7 receives the ICU signal on the seat, so that the igniter 7 explodes to generate energy to ignite the gunpowder 8. After generating energy, the gunpowder 8 breaks through the end cover 10, heats the mixed gas of argon and helium, and increases the pressure of the gas after being heated, breaking through the bursting membrane 6, so that the gas flows out from the outlet hole 18 of the diffuser 3, filling the airbag on the child seat to protect the child.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid micro gas generator for a child seat, characterized in that: The invention comprises an ignition sleeve (1), a tube body (2) and a diffuser (3), wherein the inner cavity of the tube body (2) is set as a mixed gas cavity (4), wherein a mixed gas composed of argon and helium is encapsulated in the mixed gas cavity (4), wherein the ignition sleeve (1) is plugged into a cavity opening of the mixed gas cavity (4), wherein the diffuser (3) is connected to a cavity opening of the other end of the tube body (2), wherein the diffuser (3) is provided with a gas acceleration cavity (5), wherein a bursting membrane (6) is connected to the cavity opening of the tube body (2), wherein the bursting membrane (6) separates the mixed gas cavity (4) from the gas acceleration cavity (5), wherein an ignition device (7) and gunpowder (8) are connected to one end of the ignition sleeve (1), wherein the other end of the ignition sleeve (1) is connected to a diversion filter cup (9) and an end cover (10).

2. A hybrid micro gas generator for a child seat according to claim 1, characterized in that: The inner wall of the ignition sleeve (1) is provided with a limiting boss (11); the structure of the diverter filter cup (9) is a semicircular cavity structure; the cup mouth of the diverter filter cup (9) is snap-fitted with the limiting boss (11); the protruding end of the diverter filter cup (9) is arranged opposite to the ignition device (7) and is provided with a plurality of guide holes (12); the guide holes (12) are evenly arranged on the diverter filter cup (9).

3. A hybrid micro gas generator for a child seat according to claim 2, characterized in that: The ignition sleeve (1) is provided with a connecting boss (13), and the ignition sleeve (1) is connected to the tube body (2) via the connecting boss (13). A gap exists between one end of the ignition sleeve (1) inserted into the tube body (2) and the inner wall of the tube body (2), and is provided as a circulation channel (14), and the circulation channel (14) is communicated with the mixed gas chamber (4).

4. A hybrid micro gas generator for a child seat according to claim 3, characterized in that: The diffuser (3) comprises a connecting seat (15) and an air outlet cylinder (16), one end of the connecting seat (15) is connected to the tube body (2), the other end of the connecting seat (15) is connected to the air outlet cylinder (16), the air outlet cylinder (16) is provided with an air outlet cavity (17), the air outlet cavity (17) is provided with air outlet holes (18), a plurality of air outlet holes (18) are provided and are evenly arranged on the air outlet cylinder (16), one end of the gas acceleration cavity (5) is connected to the mixed gas cavity (4), and the other end of the gas acceleration cavity (5) is connected to the air outlet cavity (17).

5. A hybrid micro gas generator for a child seat according to claim 4, characterized in that: The gas acceleration chamber (5) comprises a transition chamber (19) and a compression chamber (20); the transition chamber (19) has a semi-elliptical structure; the bursting membrane (6) is sealedly connected to the larger diameter end of the transition chamber (19); the smaller diameter end of the transition chamber (19) has the same diameter as the compression chamber (20) and is connected to the same; the inner diameter of the gas outlet chamber (17) is larger than the diameter of the compression chamber (20).

6. A hybrid micro gas generator for a child seat according to claim 1, characterized in that: The tube body (2) is provided with a through hole (21), the through hole (21) is connected to the mixed gas chamber (4), and the through hole (21) is sealed with a blocking block (22).

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