Low-noise air bag

Abstract

The utility model provides a low-noise air bag which comprises a multi-layer air bag, and the multi-layer air bag comprises a plurality of sub-air bags with upper sealing films and lower sealing films. Connecting structures are fixedly connected between the upper sealing films and the lower sealing films of the adjacent sub air bags, and through holes and first protruding parts are formed in the connecting structures. When the sub air bag is in a compressed state, the first protruding part is used for supporting the upper sealing film and the lower sealing film, and a first air channel is formed among the first protruding part, the connecting structure and the upper sealing film or the lower sealing film. Therefore, when the sub-air bag is in a compressed state, the sub-air bag can still be filled with air through the first air channel, and a vacuum environment cannot be formed. The multi-layer air bag can be gradually filled with air and cannot be immediately filled with the air, so that noise can be reduced.

Description

Technical Field

[0001] The utility model generally relates to the technical field of air bags, and in particular to a low-noise air bag. Background Art

[0002] Many existing car seats are equipped with massage air bags, which are divided into multiple layers, with through holes between the layers for gas flow, and the air bags have a compressed state and an inflated state.

[0003] When multiple layers of airbags are in a compressed state, each layer of airbags is in a vacuum state. For a single-layer airbag, the upper and lower layers of material are sucked together, and a vacuum is maintained between them. If the upper and lower layers of the airbag are sucked together during the inflation process, the airbag will not be gradually filled with air; instead, it will be filled immediately when the air pressure is high enough to stretch the two layers of the sucked airbags apart. This may cause the airbag to produce a bursting noise when it is suddenly filled with high-pressure gas, affecting the passenger experience. Utility Model Content

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide a low-noise airbag.

[0005] The utility model provides a low-noise air bag, comprising:

[0006] A multi-layer air bag, the multi-layer air bag is installed between the seat cover and the foam, or between the foam and the frame; the multi-layer air bag includes a plurality of sub-air bags, one of which is provided with at least one gas exchange port, and the plurality of sub-air bags are sequentially interconnected, and are inflated and deflated through the gas exchange ports, so as to switch between an expanded state and a compressed state;

[0007] The sub-air bag comprises an upper sealing film and a lower sealing film; a connecting structure is fixedly connected between the upper sealing film and the lower sealing film of the adjacent sub-air bags; a through hole is opened on the connecting structure, and the through hole is used to connect the adjacent sub-air bags;

[0008] The edge of the connecting structure has a first protrusion that is higher than the annular protrusion at the outer edge of the connecting structure;

[0009] When the sub-air bag is in a compressed state, the first protrusion is used to support the upper sealing film and the lower sealing film, and a first air channel is formed between the first protrusion, the connecting structure, the upper sealing film or the lower sealing film, and the first air channel is used to supply gas to fill the sub-air bag.

[0010] According to the technical solution provided by the present invention, the first protrusion 9 passes through the annular protrusion 8, is aligned with the annular protrusion 8 or has a gap with the annular protrusion 8, so that the first air channel can cross the annular protrusion to inflate the sub-airbag.

[0011] According to the technical solution provided by the present invention, the connecting structure further has a second convex portion, one end of the second convex portion protrudes from the edge of the through hole, is aligned with the edge of the through hole, or is at a position having a gap with the edge of the through hole;

[0012] A second air passage is formed among the second convex portion, the connecting structure, the upper sealing film or the lower sealing film.

[0013] According to the technical solution provided by the present invention, the connecting structure further has a third convex portion, and the third convex portion is located in the middle of the connecting structure;

[0014] A third air passage is formed among the third convex portion, the connecting structure, the upper sealing film or the lower sealing film.

[0015] According to the technical solution provided by the present invention, when the sub-airbag is in a compressed state, the first air passage, the second air passage and the third air passage are communicated in sequence.

[0016] According to the technical solution provided by the present invention, there are a plurality of the first convex portions, the second convex portions and the third convex portions, and they are alternately distributed along the circumferential direction of the connecting structure.

[0017] According to the technical solution provided by the present invention, the first convex portion, the second convex portion and the third convex portion are arranged in alignment or dislocation along the radial direction of the connecting structure.

[0018] According to the technical solution provided by the present invention, a plurality of the first convex portions, the second convex portions and the third convex portions on adjacent connecting structures are respectively arranged opposite to each other or in dislocation.

[0019] According to the technical solution provided by the present invention, the shapes of the first convex portion, the second convex portion or the third convex portion are any one or more of a rectangle, an oblong, an ellipse, a semi-oblong, a semi-ellipse, a circle, a semi-circle and a multi-petal shape.

[0020] According to the technical solution provided by the present invention, it further includes:

[0021] An anti-suction strip, the anti-suction strip is arranged on the upper sealing film or the lower sealing film, and is used for forming an air passage between the annular protrusion of the upper sealing film and the annular protrusion of the lower sealing film.

[0022] The beneficial effect of the present utility model is that:

[0023] The multi-layer airbag includes a plurality of sub-airbags each having an upper sealing film and a lower sealing film. A connecting structure is fixedly connected between the upper sealing film and the lower sealing film of adjacent sub-airbags, and through holes and first convex portions are formed thereon. When the sub-airbag is in a compressed state, the first convex portion is used to support the upper sealing film and the lower sealing film, and a first air passage is formed between the first convex portion, the connecting structure, the upper sealing film or the lower sealing film. Thus, when the sub-airbag is in a compressed state, gas can still be filled through the first air passage, and a vacuum environment will not be formed. The multi-layer airbag will gradually be filled as the gas is filled, rather than being immediately filled, so that noise can be reduced. Description of the Drawings

[0024] Other features, objects and advantages of the present utility model will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 Schematic diagram of the connection structure of a low-noise airbag;

[0026] Figure 2 Cross-sectional view of the multi-layer airbag in a compressed state;

[0027] Figure 3 Cross-sectional view of the multi-layer airbag during the inflation process;

[0028] Figure 4 Cross-sectional view of the multi-layer airbag in an inflated state;

[0029] Figure 5 Top view in the first case;

[0030] Figure 6 For Figure 5 Cross-sectional view in;

[0031] Figure 7 Top view in the second case

[0032] Figure 8 For Figure 7 Cross-sectional view in;

[0033] Figure 9 Top view in the third case

[0034] Figure 10 For Figure 9 Cross-sectional view in;

[0035] Figure 11 Schematic diagram of each air passage;

[0036] Figure 12 Schematic diagram of the connection structure in the first embodiment;

[0037] Figure 13Schematic diagram of the connection structure in the second embodiment;

[0038] Figure 14 Schematic diagram of the connection structure in the third embodiment;

[0039] Figure 15 Schematic diagram of the connection structure in the fourth embodiment;

[0040] Figure 16 Schematic diagram of the connection structure in the fifth embodiment;

[0041] Figure 17 is Figure 15 cross-sectional view in;

[0042] Figure 18 Schematic diagram when the two-layer sub-airbag is in a compressed state;

[0043] Figure 19 Schematic diagram when the two-layer sub-airbag is in an inflated state;

[0044] Figure 20 Schematic diagram of the anti-suction strip pasted on the first convex part and the second convex part;

[0045] Wherein: 1. Multi-layer airbag; 2. Sub-airbag; 3. Gas exchange port; 4. Upper sealing film; 5. Lower sealing film; 6. Connection structure; 7. Through hole; 8. Annular protrusion; 9. First convex part; 10. First air duct; 11. Second convex part; 12. Second air duct; 13. Third convex part; 14. Third air duct; 15. Anti-suction strip. Detailed implementation mode

[0046] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that, for the sake of description, only parts related to the utility model are shown in the drawings.

[0047] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and embodiments.

[0048] In the prior art, there is a height difference between the annular protrusion 8 and other parts of the connection structure 6. When the sub-airbag 2 is in a compressed state and is subjected to the extrusion force between the human body's reliance, the seat cover, and the foam or between the foam and the skeleton, the annular protrusion 8 may be mutually extruded with the adjacent upper sealing film 4 and / or lower sealing film 5, forming a vacuum adsorption adhesion and forming a sealing ring surface. When gas is filled into the multi-layer airbag 1, the gas first enters the sub-airbag 2 provided with the gas exchange port 3, and then enters other sub-airbags through the through hole 7; while the annular protrusion 8 blocks the air flow, making it difficult for the gas to break through the annular protrusion 8 and enter the inner bag body of the sub-airbag 2 outside the annular protrusion 8. Under the continuous inflation effect, the internal air pressure of the multi-layer airbag 1 gradually increases. When the pressure of the gas is sufficient to break through the seal of the annular protrusion 8, a slit appears between the upper and lower annular protrusions 8, and the gas instantaneously enters other sub-airbags 2, and the sub-airbag expands rapidly, and at this time, a loud bursting noise will be generated.

[0049] Please refer to Figure 1 , the present utility model provides a low-noise airbag, including:

[0050] A multi-layer airbag 1, the multi-layer airbag 1 is installed between the seat cover and the foam, or installed between the foam and the skeleton; the multi-layer airbag 1 includes a plurality of sub-airbags 2, and at least one gas exchange port 3 is provided on one of the sub-airbags 2, and the plurality of sub-airbags 2 are sequentially communicated with each other, and inflation and deflation are performed through the gas exchange port 3 for switching between an expanded state and a compressed state;

[0051] The sub-airbag 2 includes an upper sealing film 4 and a lower sealing film 5; a connection structure 6 is fixedly connected between the upper sealing film 4 and the lower sealing film 5 of adjacent sub-airbags 2; a through hole 7 is provided on the connection structure 6, and the through hole 7 is used to communicate adjacent sub-airbags 2;

[0052] A first protrusion 9 higher than the annular protrusion 8 at the outer edge of the connection structure 6 is provided at the edge of the connection structure 6;

[0053] When the sub-airbag 2 is in a compressed state and is subjected to the extrusion force between the human body's reliance, the seat cover, and the foam or between the foam and the skeleton, the first protrusion 9 is used to support the upper sealing film 4 and the lower sealing film 5, and a first air passage 10 is formed between the first protrusion 9, the connection structure 6, the upper sealing film 4 or the lower sealing film 5, and the first air passage 10 is used for filling gas into the sub-airbag 2.

[0054] Specifically, during the production of the multi-layer airbag 1, the two sealing films of the adjacent sub-airbags 2 need to be heated and welded to produce a small amount of molten colloid, which is then compacted by applying pressure, and finally connected to form a whole after cooling, forming a connection structure 6. In this case, the molten colloid will flow to the surroundings under pressure, overflowing the portion of the connection structure 6 to which pressure is applied, and finally the molten colloid will cool to form the annular protrusion 8.

[0055] Specifically, the improvement made by the utility model can support the upper sealing film 4 and the lower sealing film 5 of the sub-air bag 2 located inside the annular protrusion 8 and outside the through hole 7 by using the first protrusion 9 on the connecting structure 6 when the sub-air bag 2 is in a compressed state. This structural design forms a preset airflow channel, which is the first air channel 10 in this embodiment, and destroys the condition for the annular protrusion 8 to produce vacuum adsorption and adhesion.

[0056] When the multi-layer airbag 1 is filled with high-pressure gas, the gas first enters the sub-airbag provided with the gas exchange port 3, and then smoothly enters the other sub-airbags 2 through the through hole 7 and the preset first air channel 10, thereby avoiding the generation of explosion noise, reducing noise and improving comfort.

[0057] Specifically, the connection structure 6 may be provided with a first protrusion 9 on one side. When the first protrusion 9 is provided on one side, it can only provide a preset first air channel 10 for the sub-airbag 2 on this side.

[0058] Specifically, the connecting structure 6 is a sheet-like structure having two side surfaces, and therefore both side surfaces may have a first protrusion 9. A first air channel 10 is formed between the first protrusion 9, the connecting structure 6, and the upper sealing film 4 on one side; a first air channel 10 is also formed between the first protrusion 9, the connecting structure 6, and the lower sealing film 5 on the other side.

[0059] Further, refer to Figure 5 - 6 The first protrusion 9 passes through the annular protrusion 8, is aligned with the annular protrusion 8, or has a gap with the annular protrusion 8, so that the first air channel 10 can pass over the annular protrusion 8 to inflate the sub-airbag 2.

[0060] The above-mentioned methods can destroy the conditions for the annular protrusion 8 to produce vacuum adsorption and adhesion, so that the annular protrusion 8 cannot produce vacuum adsorption with the adjacent upper sealing film and / or lower sealing film.

[0061] Thus, when the sub-airbag 2 is in a compressed state, gas can still be filled in through the first air channel 10, and no vacuum adsorption will occur. The multi-layer airbag 1 will be gradually filled with gas instead of being filled immediately, thus reducing noise.

[0062] Specifically, the airbag can be 2-layer, 3-layer or multi-layer, where the three-layer is taken as an example, the compressed state, the inflation process, and the inflation state are referencedFigure 2 - 4 , two - layer airbag reference Figure 18 - 19 .

[0063] The multi - layer airbag 1 in this embodiment can be an airbag with only the function of switching the inflation and deflation states for massage or an active side - wing airbag, or a lumbar airbag with inflation, deflation, and gas - holding functions, or an airbag of the types of side - wing support, leg - rest support, soft - hardness adjustment, and head - rest support.

[0064] Figure 5 , Figure 7 and Figure 9 The dotted lines in Figure 6 , Figure 8 and Figure 10 respectively indicate the positions of the cross - sections.

[0065] Preferably, one end of the first convex portion 9 is connected to the annular convex portion 8. In this case, when the sub - airbag 2 is in a compressed state, the first air passage 10 formed between the first convex portion 9, the annular convex portion 8, the upper sealing film 4, and the lower sealing film 5 is more stable and not easily closed by external pressure.

[0066] Furthermore, referring to Figure 9 - 10 , the connecting structure 6 further has a second convex portion 11, and the height of the second convex portion 11 is higher than the height of the annular convex portion 8; one end of the second convex portion 11 protrudes from the edge of the through - hole 7, aligns with the edge of the through - hole 7, or is in a position with a gap from the edge of the through - hole 7.

[0067] Among them, the height of the second convex portion 11 above the plane where the connecting structure 6 is located also makes a second air passage 12 formed between the second convex portion 11, the connecting structure 6, the upper sealing film 4, or the lower sealing film 5.

[0068] In this embodiment, the multi - layer airbag 1 is filled with gas into the connected sub - airbag 2 through the gas exchange port 3, and the remaining sub - airbags 2 are filled with gas inward through the through - hole 7, the second air passage 12, and the first air passage 10. Setting the second convex portion 11 can make the gas filled from the through - hole 7 enter the sub - airbag 2 through the second air passage 12, improving the inflation efficiency; at the same time, preventing the generation of a vacuum adsorption effect between the middle position of the connecting structure 6 and the adjacent upper sealing film 4 and / or lower sealing film 5, and preventing the blocking of gas flow.

[0069] Furthermore, referring to Figure 7 - 8 , the connecting structure 6 further has a third convex portion 13, the third convex portion 13 is located in the middle of the connecting structure 6, and the height of the second convex portion 11 is higher than the height of the annular convex portion 8. Similarly, there are gaps between the third convex portion 13, the connecting structure 6 and the adjacent upper sealing film and / or lower sealing film, forming a preset gas flow channel, that is, the third air passage 14;

[0070] A third air passage 14 is formed between the third convex portion 13, the connecting structure 6, the upper sealing film 4 or the lower sealing film 5. The multi-layer airbag 1 is filled with the connected sub-airbags 2 through the gas exchange port 3, and the remaining sub-airbags 2 are filled with gas inward through the through holes 7, the third air passage 14, the second air passage 12, and the first air passage 10.

[0071] Further, when the sub-airbag 2 is in a compressed state, the first air passage 10, the second air passage 12, and the third air passage 14 are sequentially communicated.

[0072] Reference Figure 6 、 Figure 8 、 Figure 10 - 11 , where the dashed boxes are the positions of the respective air passages.

[0073] Specifically, in order to make the gas more smoothly filled into the sub-airbag 2 without generating a large noise, the connecting structure 6 further has a third convex portion 13 for forming the third air passage 14.

[0074] At this time, the first air passage 10, the second air passage 12, and the third air passage 14 are sequentially communicated, which can ensure that the gas filled from the through hole 7 can smoothly enter the sub-airbag 2.

[0075] Further, the first convex portion 9, the second convex portion 11, and the third convex portion 13 all have a plurality of them, and are alternately distributed along the circumferential direction of the connecting structure 6.

[0076] Further, the first convex portion 9, the second convex portion 11, and the third convex portion 13 are arranged in alignment or misalignment along the radial direction of the connecting structure 6.

[0077] In some embodiments, the first convex portion 9, the third convex portion 13, and the second convex portion 11 are arranged in a straight line, and this straight line is parallel to the radial direction of the connecting structure 6 (for the case of being aligned along the radial direction).

[0078] In some embodiments, the first convex portion 9, the third convex portion 13, and the second convex portion 11 are arranged in a straight line, and this straight line is not parallel to the radial direction of the connecting structure 6 (for the case of being misaligned along the radial direction).

[0079] In some embodiments, the first convex portion 9, the third convex portion 13, and the second convex portion 11 form a triangle, and at least any two of them are distributed in different radial directions of the connecting structure 6.

[0080] In any of the above embodiments, the projections of the adjacent first convex portion 9, third convex portion 13, and second convex portion 11 on the same radial direction of the connecting structure 6 have an overlapping part or have a gap therebetween.

[0081] Specifically, multiple alternately distributed or misaligned protrusions can form multiple air channels on the surface of the connecting structure 6, and the total gas passage area can be increased between the multiple air channels, improving the inflation speed; when one of them is closed by an external force, the other air channels can still achieve the function of inflating the sub-airbag 2.

[0082] In another embodiment, the protrusions arranged radially along the connecting structure 6 can achieve the effect of extending the air channel.

[0083] Furthermore, the multiple first protrusions 9, second protrusions 11, and third protrusions 13 on the adjacent connecting structures 6 are respectively arranged opposite to each other or misaligned with each other.

[0084] Specifically, the multiple protrusions on the multiple connecting structures 6 in the multi-layer airbag 1 are arranged opposite to each other. When in the compressed state, the multiple protrusions on the adjacent connecting structures 6 will not squeeze the air channels against each other, avoiding the closing of the air channels. For example Figure 8 as shown.

[0085] The misaligned arrangement of the multiple protrusions can enable the multiple protrusions to be inlaid with each other when the multi-layer airbag 1 is in the compressed state, making the airbag have a smaller thickness.

[0086] Furthermore, the shape of the first protrusion 9, second protrusion 11, or third protrusion 13 is any one or more of a rectangle, oblong, ellipse, semi-oblong, semi-ellipse, circle, semi-circle, and multi-petal shape.

[0087] Specifically, the multiple shape designs can prevent the sub-airbag 2 from being completely sealed to form a vacuum area when subjected to external pressure, avoiding the noise during inflation. In different application scenarios, protrusions with different shapes can be used to improve the effect of supporting the air channel.

[0088] Furthermore,, referring to Figure 15 - 17 It further includes:

[0089] An anti-suction strip 15, which is arranged on the upper sealing film 4 or the lower sealing film 5 and is used to form an air channel between the annular protrusions 8 of the upper sealing film 4 or the annular protrusions 8 of the lower sealing film 5.

[0090] In some embodiments, the anti-sticking strip 15 is made of TPU material, non-woven fabric, sponge, or PU material.

[0091] In some embodiments, the anti-sticking strip 15 uses a relatively smooth and non-sticky material, which can prevent the upper sealing film 4 or the lower sealing film 5 from sticking together and making noise during inflation. When inflating, due to the anti-suction strip 15 between the two sealing films, they do not suck together to form a vacuum area, and the gas can be smoothly filled without making noise.

[0092] This method can reduce the probability of airbag adhesion and reduce the noise generated during inflation.

[0093] Meanwhile, at least one end of the anti-suction strip 15 crosses over the annular protrusion 8 to apply pressure to the annular protrusion 8, damaging its integrity, forming a height difference at some positions of the annular protrusion 8, and further generating air channels at some positions of the annular protrusion 8.

[0094] Specifically, after the anti-suction strip 15 is pasted on the sealing film and crosses over the annular protrusion 8, both ends of the anti-suction strip 15 are fixedly pasted to the sealing film, and the middle part thereof abuts against the annular protrusion 8. Thus, the anti-suction strip 15 will apply pressure to the annular protrusion 8 to cause it to deform, the height of the part of the annular protrusion 8 that abuts against the anti-suction strip 15 decreases, while the height of the surrounding annular protrusion 8 remains unchanged, thereby generating a height difference and forming an air channel.

[0095] Specifically, referring to Figure 20 , one of the anti-suction strips 15 is respectively pasted on the surfaces of the first protrusion 9, the second protrusion 11, and the third protrusion 13 to expand the first air channel 10, the second air channel 12, and the third air channel 14.

[0096] Specifically, by using the non-adhesive anti-stick strip 15 to connect multiple protrusions, the anti-stick strip 15 can support the sealing film of multiple air channel parts, making the air channels between multiple protrusions more stable and not easily closed by external pressure.

[0097] Referring to Figure 12 - 16 , they are respectively the protrusions on the connection structure and the arrangement manner of the anti-stick strip 15 in the first to fifth embodiments.

[0098] Among them, taking Figure 12 as an example, part of the first protrusion 9 is semi-circular and part is oblong, the second protrusion 11 is semi-oblong, and the third protrusion 13 is multi-petal-shaped. Each protrusion can also be set in a combination of various shapes, which will not be enumerated one by one here.

[0099] The above description is only the preferred embodiments of the present utility model and the description of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the present utility model is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept of the utility model. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present utility model.

Claims

1. A low noise air bag, characterized in that: include: A multi-layer air bag (1), the multi-layer air bag (1) being installed between a seat cover and foam, or between foam and a frame; the multi-layer air bag (1) comprising a plurality of sub-air bags (2), one of the sub-air bags (2) being provided with at least one gas exchange port (3), the plurality of sub-air bags (2) being interconnected in sequence, and being inflated and deflated through the gas exchange ports (3) for switching between an expanded state and a compressed state; The sub-airbags (2) comprise an upper sealing film (4) and a lower sealing film (5); a connecting structure (6) is fixedly connected between the upper sealing film (4) and the lower sealing film (5) of adjacent sub-airbags (2); a through hole (7) is provided on the connecting structure (6), and the through hole (7) is used to connect adjacent sub-airbags (2); The edge of the connecting structure (6) has a first protrusion (9) which is higher than the annular protrusion (8) at the outer edge of the connecting structure (6); When the sub-air bag (2) is in a compressed state, the first protrusion (9) is used to support the upper sealing film (4) and the lower sealing film (5), and a first air channel (10) is formed between the first protrusion (9), the connecting structure (6), and the upper sealing film (4) or the lower sealing film (5), and the first air channel (10) is used to supply gas to fill the sub-air bag (2).

2. A low noise airbag according to claim 1, characterized in that: The first protrusion (9) passes through the annular protrusion (8), is aligned with the annular protrusion (8), or has a gap with the annular protrusion (8), so as to enable the first air channel (10) to cross the annular protrusion (8) and inflate the sub-airbag (2).

3. A low noise airbag according to claim 1, characterized in that: The connecting structure (6) also has a second protruding portion (11), one end of which protrudes from the edge of the through hole (7), is aligned with the edge of the through hole (7), or is located at a position spaced apart from the edge of the through hole (7); A second air channel (12) is formed between the second protruding portion (11), the connecting structure (6), the upper sealing film (4) or the lower sealing film (5).

4. A low noise airbag according to claim 3, characterized in that: The connection structure (6) also has a third protruding portion (13), and the third protruding portion (13) is located in the middle of the connection structure (6); A third air channel (14) is formed between the third protruding portion (13), the connecting structure (6), and the upper sealing film (4) or the lower sealing film (5).

5. A low noise airbag according to claim 4, characterized in that: When the sub-air bag (2) is in a compressed state, the first air channel (10), the second air channel (12) and the third air channel (14) are connected in sequence.

6. A low noise airbag according to claim 4, characterized in that: The first protrusion (9), the second protrusion (11) and the third protrusion (13) are multiple in number and are alternately distributed along the circumference of the connection structure (6).

7. A low noise airbag according to claim 4, characterized in that: The first protrusion (9), the second protrusion (11) and the third protrusion (13) are arranged in an aligned or staggered manner along the radial direction of the connection structure (6).

8. A low noise airbag according to claim 4, characterized in that: The plurality of first protrusions (9), second protrusions (11) and third protrusions (13) on the adjacent connection structures (6) are respectively arranged opposite to each other or staggered with each other.

9. A low noise airbag according to claim 4, characterized in that: The shapes of the first protrusion (9), the second protrusion (11) or the third protrusion (13) are any one or more of rectangular, oblong, elliptical, semi-oblong, semi-elliptical, circular, semicircular and multi-petal shapes.

10. A low noise airbag according to claim 1, characterized in that: Also includes: An anti-suction strip (15) is arranged on the upper sealing film (4) or the lower sealing film (5) and is used to form an air passage between the annular protrusion (8) of the upper sealing film (4) and the annular protrusion (8) of the lower sealing film (5).

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