Double-layer air guide bag

Abstract

The utility model discloses a double-layer air guide bag which comprises an inner cloth piece and an outer cloth piece. The inner cloth piece is folded along the axis, so that the edges of the two ends of the inner cloth piece are close to each other, and at least parts of the edges of the two ends of the inner cloth piece are connected in a sewing mode through inner sewing thread parts to form an inner air guide bag with an inner air inlet and at least one inner air guide outlet. The outer cloth piece is folded along the axis so that the edges of the two ends of the outer cloth piece can be close to each other, at least parts of the edges of the two ends of the outer cloth piece are connected in a sewing mode through outer sewing thread parts to form an outer air guide bag, at least part of the inner air guide bag is sleeved with the outer air guide bag, and at least part of the inner sewing thread parts are covered with the outer cloth piece. The air guide bag solves the problem that an air guide bag formed by sewing after an existing cloth piece is folded is prone to breakage, and the integrity and stability of the air guide bag are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive safety devices, and particularly relates to a double-layer air guide bag. Background Art

[0002] An air guide bag is usually installed inside an airbag, and a gas generator is inserted at the internal air inlet thereof. When the gas generator is detonated, the gas generated by the gas generator is guided to flow into the airbag. A conventional air guide bag is usually formed by overlapping and then folding two main fabric pieces, and then the four fabric pieces formed by folding the two main fabric pieces are sewn together with stitches.

[0003] In the prior art, an instantaneous strong impact force is generated after the gas generator is detonated. Since the stitches of the air guide bag pass through the four fabric pieces formed by folding the two main fabric pieces, the air guide bag will rupture at the stitches when the stitches are subjected to the instantaneous strong impact force, resulting in the air guide bag being unable to drain the gas; in the prior art, the number of layers of the main fabric pieces is usually increased, the number of stitches is increased, or fabric pieces and stitches with higher strength are used to prevent the air guide bag from rupturing at the stitches, but this undoubtedly increases the production cost.

[0004] Based on this, a new technical solution is needed. Summary of the Utility Model

[0005] In view of this, embodiments of the present utility model provide a double-layer air guide bag to at least solve the problem that the air guide bag is prone to rupture at the stitches when being inflated in the prior art.

[0006] Embodiments of the present utility model provide the following technical solutions:

[0007] Embodiments of the present utility model provide a double-layer air guide bag, including:

[0008] An inner fabric piece, the inner fabric piece is folded along the axis so that the two end edges of the inner fabric piece are close to each other, and at least part of the two end edges of the inner fabric piece are sewn and connected through an inner stitch part to form an inner air guide bag having an inner air inlet and at least one inner air guide outlet;

[0009] An outer fabric piece, the outer fabric piece is folded along the axis so that the two end edges of the outer fabric piece are close to each other, and at least part of the two end edges of the outer fabric piece are sewn and connected through an outer stitch part to form an outer air guide bag. The outer air guide bag sleeved at least part of the inner air guide bag, and the outer fabric piece covers at least part of the inner stitch part;

[0010] Wherein, when the inner air guide bag is inflated by the impact of gas, the outer air guide bag expands synchronously with the inner air guide bag, and the gas can flow outwards through the inner air guide outlet.

[0011] Further, the outer cloth piece covers at least a part of the inner sewing line portion in the air outlet direction of the inner air inlet.

[0012] Further, the inner sewing line portion and the outer sewing line portion are arranged in a dislocation manner so that the inner sewing line portion corresponds to the non-sewing area of the outer cloth piece.

[0013] Further, the inner sewing line portion is arranged corresponding to the central axis of the outer cloth piece.

[0014] Further, multiple sewing line portions are used to sew and fix the inner air guide bag and the outer air guide bag.

[0015] Further, the part of the inner sewing line portion not covered by the outer cloth piece is multiple sewing lines.

[0016] Further, the expansion size of the inner air guide bag is smaller than the expansion size of the outer air guide bag.

[0017] Further, the extending direction of the braided wire of the inner cloth piece has an included angle with the extending direction of the braided wire of the outer cloth piece.

[0018] Further, the inner air guide bag includes:

[0019] An air inlet portion, on which an inner air inlet is formed;

[0020] An air guide portion, which is communicated with the air inlet portion, and at least one inner air guide outlet is formed on the air guide portion;

[0021] Wherein, the outer air guide bag at least sleeved part of the air guide portion.

[0022] Further, the outer air guide bag includes an outer air inlet and at least one outer air guide outlet. The outer air inlet is in the air outlet direction of the inner air inlet or sleeved outside the inner air inlet, and the outer air guide outlet is in the air outlet direction of the inner air guide outlet or sleeved outside the inner air guide outlet.

[0023] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of the present invention at least include:

[0024] A double-layer air guide bag of the present invention forms an inner air guide bag by sewing an inner cloth piece with an inner sewing line portion, forms an outer air guide bag by sewing an outer cloth piece with an outer sewing line portion, and sleeved the inner air guide bag inside the outer air guide bag. Thus, when the inner air guide bag is impacted by gas and ruptures at the inner sewing line portion, since the outer cloth piece covers the inner air guide bag, the outer cloth piece can also continue to guide the gas, so as to ensure the integrity and functionality of the air guide bag, solve the problem of insufficient integrity after the air guide bag ruptures from the sewing line when being inflated in the prior art, and improve the safety of the air guide bag. Brief Description of the Drawings

[0025] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the inner fabric piece of the embodiment of the present utility model;

[0027] Figure 2 It is a schematic structural diagram (I) of the outer fabric piece of the embodiment of the present utility model;

[0028] Figure 3 It is a schematic structural diagram of the inner air guide bag of the embodiment of the present utility model;

[0029] Figure 4 It is a schematic structural diagram (I) of the outer air guide bag of the embodiment of the present utility model;

[0030] Figure 5 It is a schematic structural diagram (I) of a double-layer air guide bag of the embodiment of the present utility model;

[0031] Figure 6 It is a schematic structural diagram (II) of the outer fabric piece of the embodiment of the present utility model;

[0032] Figure 7 It is a schematic structural diagram (II) of the outer air guide bag of the embodiment of the present utility model;

[0033] Figure 8 It is a schematic structural diagram (II) of a double-layer air guide bag of the embodiment of the present utility model;

[0034] Figure 9 It is a schematic diagram of the knitting threads corresponding to the inner fabric piece and the outer fabric piece of the embodiment of the present utility model.

[0035] The reference numerals of the present utility model are as follows:

[0036] 10. Inner fabric piece; 20. Inner sewing part; 30. Inner air guide bag; 31. Inner air inlet; 32. Inner air guide outlet; 33. Air inlet part; 34. Air guide part; 40. Outer fabric piece; 50. Outer sewing part; 60. Outer air guide bag; 70. Multi-channel sewing part. Detailed Embodiment

[0037] The embodiments of the present application will be described in detail below with reference to the drawings.

[0038] The following describes the implementation modes of the present application through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0039] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects described herein can be used to implement the device and / or practice the method. Additionally, this device can be implemented and this method can be practiced using other structures and / or functionality in addition to one or more of the aspects described herein.

[0040] It also needs to be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner. The diagrams only show the components related to the present application and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in its actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0041] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the examples can be practiced without these specific details.

[0042] In the prior art, the air guiding bag usually overlaps two layers of cloth pieces, then folds the two layers of cloth pieces simultaneously, and then sews the two ends of the folded double-layer cloth pieces with a sewing thread. At this time, the sewing thread passes through the two end parts of the double-layer cloth pieces in sequence. Therefore, when encountering a gas generator with a large output, the air guiding bag formed by overlapping and sewing two conventional main cloth pieces together cannot withstand the instantaneous strong impact, resulting in rupture at the sewing thread and failing to meet the requirements for the integrity of the air guiding bag. Existing optimization solutions often adopt methods such as increasing the number of cloth layers, increasing the number of sewing threads, or using cloth pieces and sewing threads with higher strength to improve the strength of the air guiding bag. This design is relatively complex, has a high cost, and will make the package shape at the module air guiding bag larger, which is not conducive to the space layout of the module on the vehicle and is also not conducive to the fitting of the dust cover.

[0043] Moreover, with the continuous development of the automotive market, the competition in the automotive industry is becoming increasingly fierce, and the airbag industry has higher and higher requirements for performance, cost, and manufacturability. In the case of ensuring high performance, low BOM cost, and manufacturability cost, only through continuous innovative design can competitive advantages be obtained.

[0044] Based on this, the embodiments of this specification propose a processing solution: as Figures 1 to 5 shown, a double-layer air guiding bag of the present utility model sleeves the inner air guiding bag 30 inside the outer air guiding bag 60, and makes the inner sewing thread part 20 of the inner air guiding bag 30 and the outer sewing thread part 50 of the outer air guiding bag 60 be arranged in a dislocation manner. Thus, even if the sewing thread of the inner air guiding bag 30 is broken or the inner air guiding bag 30 ruptures at the inner sewing thread part 20, the outer cloth piece 40 of the outer air guiding bag 60 can conduct the gas when being impacted by the gas, avoiding the complete damage of the air guiding bag and solving the problem that the air guiding bag in the prior art cannot conduct the gas due to the bursting or rupture at the sewing thread.

[0045] The following will describe the technical solutions provided by the embodiments of this application in conjunction with the accompanying drawings.

[0046] As Figures 1 to 8 shown, a double-layer air guiding bag of the present utility model includes an inner cloth piece 10 and an outer cloth piece 40. The inner cloth piece 10 is folded along the axis so that the two end edges of the inner cloth piece 10 are close to each other, and at least part of the two end edges are sewn and connected through the inner sewing thread part 20 to form an inner air guiding bag 30 having an inner air inlet 31 and at least one inner air guiding outlet 32; the outer cloth piece 40 is folded along the axis and the two end edges of the outer cloth piece 40 are close to each other, and at least part of the two ends of the outer cloth piece 40 are sewn and connected through the outer sewing thread part 50 to form an outer air guiding bag 60. The outer air guiding bag 60 sleeves at least part of the inner air guiding bag 30, and the outer cloth piece 40 covers at least part of the inner sewing thread part 20. Among them, when the inner air guiding bag 30 is inflated by the impact of the gas, the outer air guiding bag 60 expands synchronously with the inner air guiding bag 30, and the gas can flow out through the inner air guiding outlet 32.

[0047] Among them, the inner fabric piece 10 has a preset shape, such as Figure 1 the shape shown, which forms a generally L-shaped air guide bag after being folded along the central axis.

[0048] In some embodiments thereof, the inner fabric piece 10 can be flexibly set to various different shapes according to actual needs, so that the inner air guide bag 30 formed after folding is formed into other shapes.

[0049] In some embodiments thereof, the inner fabric piece 10 can be formed by sewing two or more sub-fabric pieces together, or can be obtained by cutting a complete fabric piece.

[0050] Among them, the folding of the inner fabric piece 10 along the axis means folding along a certain axis of the inner fabric piece 10 according to the shape of the inner fabric piece 10 so that the two end edges of the inner fabric piece 10 approach each other, and preferably the two end edges of the inner fabric piece 10 are aligned.

[0051] Specifically, after the inner fabric piece 10 is folded to form a preliminary shape of the inner air guide bag 30, then stitches are made along the two end edges of the inner fabric piece 10 to form an inner stitch part 20, and the inner fabric piece 10 is formed into an inner air guide bag 30 having an inner air inlet 31 and an inner air guide outlet 32.

[0052] Among them, the inner air inlet 31 is at least used to insert the air outlet end of the gas generator, and the inner air guide outlet 32 is used to guide the gas conveyed by the gas generator, so that the gas flows out along the air outlet direction of the inner air guide outlet 32.

[0053] Among them, the outer fabric piece 40 has a preset shape, and its shape can be the same as or different from that of the inner fabric piece 10. After the outer fabric piece 40 is folded along the axis, an outer air guide bag 60 that can wrap the inner air guide bag 30 is formed.

[0054] In some embodiments thereof, such as Figure 2 、 6 shown, the outer fabric piece 40 can be set to different shapes according to actual needs, such as a "convex" shape.

[0055] In some embodiments thereof, the outer fabric piece 40 can be formed by sewing two or more sub-fabric pieces together, or can be obtained by cutting a complete fabric piece.

[0056] Preferably, both the inner fabric piece 10 and the outer fabric piece 40 are obtained by cutting a complete fabric piece to enhance the firmness of the inner fabric piece 10 and the outer fabric piece 40.

[0057] Specifically, after the outer fabric piece 40 is folded along the axis, the preliminary shape of the outer air guide bag 60 is formed, and the two end edges of the outer fabric piece 40 are set, and stitches are used to sew along the two end edges of the outer fabric piece 40 to form an outer stitching part 50, and at the same time, the outer fabric piece 40 forms an outer air guide bag 60 with only an external air inlet and an external air guide outlet.

[0058] When the outer air guiding bag 60 is mounted on the inner air guiding bag 30, the outer air guiding bag 60 at least covers the air guiding portion 34 of the inner air guiding bag 30, and when the inner air guiding bag 30 is expanded by the impact of gas, the outer air guiding bag 60 can also unfold along with the inner air guiding bag 30, so that when the inner air guiding bag 30 ruptures, the outer air guiding bag 60 can still play an air guiding role.

[0059] Specifically, when the inner air guiding bag 30 is inflated, the inner air guiding bag 30 drives the outer air guiding bag 60 to unfold synchronously. If the inner air guiding bag 30 ruptures at the inner seam portion 20, the gas flows out of the inner air guiding bag 30 into the outer air guiding bag 60. The outer air guiding bag 60 can continue to drain the gas. Moreover, since the inner seam portion 20 of the inner air guiding bag 30 has been impacted by most of the gas, the impact force on the outer air guiding bag 60 is reduced, thereby ensuring the normal use of the air guiding bag.

[0060] Furthermore, after the outer air guiding bag 60 is sleeved on the inner air guiding bag 30, the outer air guiding bag 60 and the inner air guiding bag 30 are fixedly connected, such as by sewing or gluing, to prevent the outer air guiding bag 60 from separating from the inner air guiding bag 30 when the inner air guiding bag 30 is inflated and unfolded.

[0061] Preferably, if Figure 5 , 8 As shown, when the inner air guide bag 30 is placed on the outer air guide bag 60, the inner air guide bag 30 and the outer air guide bag 60 are sewn and fixed using a plurality of stitches 70. The plurality of stitches 70 can be sewn along the edge of the inner air guide bag 30 or the outer air guide bag 60, and the plurality of stitches 70 will not affect the unfolding of the inner air guide bag 30 and the outer air guide bag 60 after sewing.

[0062] Furthermore, the outer fabric sheet 40 at least covers a portion of the inner stitching portion 20 located in the air outlet direction of the inner air inlet 31, so that when the inner stitching portion 20 located in the air outlet direction of the inner air inlet 31 breaks or the inner fabric sheet 10 ruptures therefrom, the outer fabric sheet 40 can still guide the gas.

[0063] Among them, since the inner stitching portion 20 located in the air outlet direction of the inner air inlet 31 is directly impacted by the gas, after the outer air guide bag 60 is mounted on the inner air guide bag 30, the outer cloth piece 40 at least covers part of the inner stitching portion 20 located in the air outlet direction of the inner air inlet 31, so that after the inner air guide bag 30 ruptures at this location, the outer cloth piece 40 can still guide the gas.

[0064] Preferably, the outer cloth piece 40 entirely covers the inner suture part 20 in the air outlet direction of the inner air inlet 31.

[0065] In some of these embodiments, the uncovered part of the inner suture part 20 may also be provided with multiple sutures to increase the firmness of the inner suture part 20.

[0066] Furthermore, the inner suture part 20 and the outer suture part 50 are arranged in a dislocation manner so that the inner suture part 20 corresponds to the non-suture area of the outer cloth piece 40, thereby improving the safety and stability of the air guiding bag.

[0067] Among them, the non-suture area of the outer cloth piece 40 is mainly the cloth piece part of the outer cloth piece 40.

[0068] Among them, because the inner suture part 20 and the non-suture area of the outer cloth piece 40 are arranged corresponding to each other, when the inner air guiding bag 30 ruptures at the inner suture part 20, the non-suture area of the outer cloth piece 40 is first impacted by the gas, avoiding the risk of the outer suture part 50 of the outer air guiding bag 60 being impacted by the gas and breaking or the outer cloth piece 40 at the outer suture part 50 of the outer air guiding bag 60 being ruptured.

[0069] Preferably, the inner suture part 20 corresponds to the central axis of the outer cloth piece 40 so that the inner suture part 20 is far from the outer suture part 50, and when the inner suture part 20 ruptures and the gas overflows from the inner air guiding bag 30, the gas is evenly dispersed into the outer air guiding bag 60.

[0070] Specifically, when the inner air guiding bag 30 ruptures at the inner suture part 20, the gas impacts the central axis position of the outer cloth piece 40. After the central axis of the outer cloth piece 40 is impacted by the gas, both ends of the outer cloth piece 40 are simultaneously subjected to tensile forces, thereby enabling the entire outer air guiding bag 60 to remain stable, and also avoiding the outer suture part 50 of the outer cloth piece 40 from breaking due to uneven force or the part of the outer cloth piece 40 at the outer suture part 50 from breaking due to uneven force.

[0071] In some of these embodiments, the expansion size of the inner air guiding bag 30 is smaller than the expansion size of the outer air guiding bag 60. When the overall force on the air guiding bag is relatively large, the inner air guiding bag 30 can rupture along the inner suture part 20, so that the inner air guiding bag 30 is used as a sacrificial bag, thereby reducing the internal pressure of the entire air guiding bag, ensuring that the outer air guiding bag 60 is not damaged, and also ensuring that the overall air guiding and diversion function of the air guiding bag is not affected.

[0072] Among them, the strength of the suture used at the inner suture part 20 can be weaker than the strength of the suture at the outer suture part 50, so as to facilitate the disconnection of the suture at the inner suture part 20.

[0073] Preferably, the expansion size of the inner air guiding bag 30 is slightly smaller than the expansion size of the outer air guiding bag 60, so that the inner air guiding bag 30 can be attached to the outer air guiding bag 60 after being unfolded, but does not exert too much pressure on the outer air guiding bag 60.

[0074] In some of these embodiments, as Figure 9 shown, the extending direction of the braided threads of the inner fabric piece 10 has an included angle with the extending direction of the braided threads of the outer fabric piece 40, so that after the inner air guiding bag 30 and the outer air guiding bag 60 are unfolded, the braided threads of the inner fabric piece 10 and the braided threads of the outer fabric piece 40 form a mesh structure to enhance the overall strength of the air guiding bag.

[0075] Specifically, when forming the inner fabric piece 10 and the outer fabric piece 40, the complete fabric piece can be inclined and cut, so that after the inner air guiding bag 30 is formed in the inner fabric piece 10, the outer air guiding bag 60 is formed in the outer fabric piece 40, and after the inner air guiding bag 30 is sleeved on the outer air guiding bag 60, the braided threads of the inner fabric piece 10 and the outer fabric piece 40 have an included angle.

[0076] In some of these embodiments, as Figure 3 shown, the inner air guiding bag 30 includes an air inlet part 33 and an air guiding part 34. Among them, an inner air inlet 31 is formed on the air inlet part 33; the air guiding part 34 is communicated with the air inlet part 33, and at least one inner air guiding outlet 32 is formed on the air guiding part 34; among them, the outer air guiding bag 60 at least sleeves part of the air guiding part 34.

[0077] Preferably, the outer air guiding bag 60 sleeves all of the air guiding part 34 to continue to divert the gas when the air guiding part 34 is broken.

[0078] More preferably, the outer air guiding bag 60 can be sleeved on both the air inlet part 33 and the air guiding part 34 at the same time.

[0079] In some of these embodiments, when the outer air guiding bag 60 includes an outer air inlet and at least one outer air guiding outlet, the outer air inlet is located in the air outlet direction of the inner air inlet 31 or sleeved outside the inner air inlet 31, and the outer air guiding outlet is located in the air outlet direction of the inner air guiding outlet 32 or sleeved outside the inner air guiding outlet 32.

[0080] When the double-layer air guiding bag of the present utility model generates instantaneously high-pressure and high-temperature gas by the gas generator, it can balance the forces on the fabric pieces and the sewing threads of the air guiding bag and avoid the overall rupture of the air guiding bag. The fabric pieces of the double-layer air guiding bag of the present utility model are cut along different warp and weft directions, so that after the outer fabric piece 40 and the inner fabric piece 10 overlap, the directions of the braided threads between the outer fabric piece 40 and the inner fabric piece 10 have an included angle and are arranged crosswise, thereby strengthening the bearing strength of the double-layer air guiding bag.

[0081] The double-layer air guide bag of the present utility model is composed of two or more sub-air guide bags. The sub-air guide bags are independently sutured, then sleeved, and finally fixed together by sutures. Due to the spatial arrangement, the inflation space of the inner air guide bag 30 is smaller than that of the outer air guide bag 60. After the gas generator outputs gas, the inner air guide bag 30 will be filled first and expand by virtue of the elasticity of the cloth piece. The presence of the outer air guide bag 60 will limit the expansion of the inner air guide bag 30 to a certain extent to ensure the integrity of the inner air guide bag 30. At the same time, it forms an inflation cavity with higher strength when superimposed with the inner air guide bag 30, thereby forming a two-stage stress structure. The first-stage structure is borne by the inner air guide bag 30, and the inner air guide bag 30 expands to absorb energy. The second-stage structure is jointly borne by the inner and outer air guide bags 60. In addition, the sutures of the inner and outer air guide bags 60 are staggered from each other, which can enable the complete cloth piece to protect and fix the sutures, and there are complete cloth pieces in the areas where the air guide bag is easily damaged, so that it can withstand a generator with a larger initial output and protect the integrity of the air bag.

[0082] The air guide bag described in the present utility model can meet the requirements for the integrity of the main air bag without adding cloth pieces, sutures, or replacing them with stronger cloth pieces or sutures, streamline the BOM, and reduce costs.

[0083] In this specification, the same or similar parts among the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the descriptions are relatively simple, and the relevant parts can be referred to the partial descriptions of the system embodiments.

[0084] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A double-layer air guide bag, characterized in that, Comprising: An inner fabric piece, the two end edges of the inner fabric piece are made to approach each other by folding along the axis, and at least part of the two end edges of the inner fabric piece are sewn and connected by an inner sewing part to form an inner air guiding bag having an inner air inlet and at least one inner air guiding outlet; An outer fabric piece, the two end edges of the outer fabric piece are made to approach each other by folding along the axis, and at least part of the two end edges of the outer fabric piece are sewn and connected by an outer sewing part to form an outer air guiding bag, the outer air guiding bag sleeving at least part of the inner air guiding bag, and the outer fabric piece covering at least part of the inner sewing part; Wherein, when the inner air guiding bag is inflated by the impact of gas, the outer air guiding bag expands synchronously with the inner air guiding bag, and the gas can flow outwards through the inner air guiding outlet.

2. The double-layer air guide bag according to claim 1, characterized in that, The outer fabric piece covers at least part of the inner sewing part located in the air outlet direction of the inner air inlet.

3. The double-layer air guiding bag according to claim 2, characterized in that, The inner sewing part and the outer sewing part are arranged in a staggered manner so that the inner sewing part corresponds to the non-sewing area of the outer fabric piece.

4. The double-layer air guide bag according to claim 3, wherein, The inner sewing part and the central axis of the outer fabric piece are arranged correspondingly.

5. The double-layer air guide bag according to claim 4, characterized in that, Multiple sewing parts are used to sew and fix the inner air guiding bag and the outer air guiding bag.

6. The double-layer air guide bag according to claim 5, characterized in that, The part of the inner sewing part not covered by the outer fabric piece is multiple stitches.

7. The double-layer air guide bag according to claim 1, wherein, The inflation size of the inner air guiding bag is smaller than the inflation size of the outer air guiding bag.

8. The double-layer air guiding bag according to claim 1, characterized in that, The extending direction of the braided wire of the inner fabric piece and the extending direction of the braided wire of the outer fabric piece have an included angle.

9. The double-layer air guide bag according to any one of claims 1 to 8, characterized in that, The inner air guiding bag includes: An air inlet part, an inner air inlet is formed on the air inlet part; An air guiding part, the air guiding part is communicated with the air inlet part, and at least one of the inner air guiding outlets is formed on the air guiding part; Wherein, the outer air guiding bag sleevs at least part of the air guiding part.

10. The double-layer air guiding bag according to claim 9, characterized in that, The outer air guiding bag includes an outer air inlet and at least one outer air guiding outlet, the outer air inlet is located in the air outlet direction of the inner air inlet or sleeved outside the inner air inlet, and the outer air guiding outlet is located in the air outlet direction of the inner air guiding outlet or sleeved outside the inner air guiding outlet.

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