Diffuser for airbag and passenger airbag

Abstract

The present invention relates to a diffuser for an airbag and a passenger airbag. The diffuser for the airbag comprises: a diffuser bag, located in the airbag main body of the airbag, wherein an inlet of the diffuser bag is fixed to an inflation opening of the airbag main body and communicated with the inflation opening of the airbag main body; and a blocking portion, located in the diffuser bag, wherein the blocking portion is fixedly connected to opposite cloth pieces of the diffuser bag to block gas from passing, and the outer wall of the blocking portion and the inner wall of the diffuser bag form curved and bifurcated gas inlet channels. The curved and bifurcated gas inlet channels are formed by means of the blocking portion in the diffuser bag, so that the gas flow rate of gas generated by a gas generator is decreased, and the pressure in the airbag within first 10 milliseconds is decreased, so as to moderate the deployment process of the airbag, thus ensuring the integrity of the airbag and the integrity of a windshield, dashboard and instrument panel around the airbag, and facilitating use of materials having more cost-effective advantages.

Description

Diffusers for airbags and passenger airbags Technical Field

[0001] The present invention relates to the technical field of airbags, and in particular to a diffuser for an airbag and a passenger airbag. Background Art

[0002] The gas generator (also known as the inflator) releases gas into the airbag to deploy it. Because the reactive gas within the gas generator is released instantly and at a very high velocity, the mechanical stress or peak pressure exerted on the airbag during the initial stages of deployment (e.g., the first 10 milliseconds) is very high. This can negatively impact the integrity of the airbag and the surrounding areas, including the windshield, dashboard, and instrument panel.

[0003] Related technologies often use conventional diffusers at the airbag's inlet or special materials to manufacture the airbag. However, conventional diffusers only ensure stability and integrity during inflation and fail to reduce the velocity of the gas generated by the inflator entering the airbag. Airbags made of special materials often offer no advantages and increase costs.

[0004] Summary of the Invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a diffuser for an airbag and a passenger airbag.

[0006] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a diffuser for an airbag, comprising: a diffuser bag located inside an airbag body of the airbag, the inlet of the diffuser bag being fixed at the inflation port of the airbag body and being connected to the inflation port of the airbag body; a blocking portion located inside the diffuser bag, wherein the blocking portion is fixedly connected to a cloth piece opposite to the diffuser bag to block gas from passing through, and an outer wall of the blocking portion and an inner wall of the diffuser bag form a curved and forked air inlet channel.

[0007] In some embodiments, the blocking portion includes two columns, each column of the blocking portion includes a plurality of parallel sub-blocking portions, and the sub-blocking portions extend obliquely from the gas inflation direction of the diffuser bag toward the edge of the diffuser bag, so that the blocking portion is trumpet-shaped as a whole.

[0008] In some embodiments, along a direction perpendicular to the gas inflation direction, the two columns of blocking portions are spaced apart to form a main air intake channel; a branch air intake channel is formed between two adjacent sub-blocking portions in each column of blocking portions, and the branch air intake channel is located on both sides of the main air intake channel and is connected to the main air intake channel.

[0009] In some embodiments, in the gas inflation direction, the sub-blocking portions in two columns of the blocking portions are arranged flush with each other.

[0010] In some embodiments, the end of the blocking portion is rounded, and the diameter of the end of the blocking portion is greater than the width of the middle portion of the blocking portion, so that the blocking portion is dog-bone shaped.

[0011] In some embodiments, the sub-blocking portions in each column of the blocking portions include: a short blocking portion; and a long blocking portion, wherein the long blocking portion is parallel to the short blocking portion, crosses the short blocking portion and is spaced apart, wherein, along the gas inflation direction, one end of the long blocking portion is flush with one end of the short blocking portion, and the other end of the long blocking portion is engaged with the edge of the diffuser bag to block the gas from passing through, and the other end of the short blocking portion is spaced apart from the edge of the diffuser bag.

[0012] In some embodiments, the air inlet passage formed by the outer wall of the blocking portion and the inner wall of the diffuser bag is in the shape of a Tesla valve.

[0013] In some embodiments, the diffuser bag includes a first cloth piece and a second cloth piece, the edges of the first cloth piece and the second cloth piece are sewn together with sewing thread, and the middle parts of the first cloth piece and the second cloth piece are sewn together with sewing thread to form the blocking portion.

[0014] In some embodiments, the diffuser bag is in the shape of a rectangular cylinder and is integrally formed.

[0015] According to a first aspect of an embodiment of the present disclosure, the present disclosure provides a passenger airbag, comprising: an airbag body, comprising an inflation port; an inflator, the exhaust port of the inflator being connected to the inflation port; a diffuser for the airbag as described in the first aspect, located inside the airbag body of the airbag, the inlet of the diffuser bag being fixed at the inflation port of the airbag body and being connected to the inflation port of the airbag body.

[0016] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: a curved and bifurcated air intake channel is formed through the blocking portion in the diffuser bag, thereby reducing the airflow velocity of the gas generated by the gas generator, reducing the pressure in the airbag in the first 10 milliseconds, and slowing down the deployment process of the airbag, thereby ensuring the integrity of the airbag and the integrity of the windshield, dashboard and instrument panel around the airbag, and facilitating the application of more cost-effective materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] FIG1 is a perspective schematic diagram showing a passenger airbag in a deployed state according to an exemplary embodiment;

[0019] FIG2 is a perspective view of FIG1 including the diffuser bag;

[0020] FIG3 is a perspective schematic diagram of the diffuser bag in FIG2 ;

[0021] FIG4 is a perspective schematic diagram of the diffuser bag in FIG2 from another perspective;

[0022] FIG5 is a cross-sectional view of the passenger airbag in FIG1 ;

[0023] FIG6 is a schematic diagram of a barrier portion within a diffuser bag according to another exemplary embodiment;

[0024] FIG7 is a schematic diagram of a barrier portion within a diffuser bag according to yet another exemplary embodiment;

[0025] FIG8 is a pictorial diagram of a diffuser bag according to an exemplary embodiment;

[0026] FIG. 9 is a pictorial diagram of a diffuser bag according to another exemplary embodiment. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0028] To solve the above technical problems, the present disclosure provides a diffuser 10 for an airbag 100 . Preferably, the airbag 100 may be a passenger airbag 100 , that is, an airbag 100 located on the passenger side.

[0029] The passenger airbag 100 includes an airbag body 20 (as shown in FIG1 ), an inflator (not shown), and a diffuser 10. The airbag body 20 is made of a special bag material and can be in an expanded state or a folded state.

[0030] The airbag body 20 includes an inflation port 21, and the inflator has an exhaust port. The exhaust port of the inflator is connected to the inflation port 21 of the airbag body 20, thereby inflating the airbag body 20 and deploying the passenger airbag 100. It should be noted that the shape of the airbag body 20 in Figure 1 is merely exemplary and is not intended to limit the scope of protection of this disclosure. In other embodiments, the shape of the airbag body 20 can be modified according to the designer's needs and is not specifically limited here.

[0031] The diffuser 10 may be a cylindrical structure, and the diffuser 10 is located inside the airbag body 20 to reduce the flow rate of the gas entering the airbag body 20 .

[0032] Specifically, the diffuser 10 includes a diffuser bag 11. The diffuser bag 11 can also be made of a piece of cloth, so that when the passenger airbag 100 is folded, the diffuser bag 11 can also be folded along with the passenger airbag 100.

[0033] The diffuser bag 11 is located at the inflation port 21 of the air bag body 20. The diffuser bag 11 can be a cylindrical structure. The diffuser bag 11 can include an inlet 111 and an outlet 112. The inlet 111 of the diffuser bag 11 is fixed at the inflation port 21 of the air bag body 20 and is connected to the inflation port 21 of the air bag body 20.

[0034] The inlet 111 of the diffuser bag 11 needs to completely cover the inflation port 21 of the airbag body 20. For example, as shown in FIG3 and FIG4 , the inner wall of the inlet 111 of the diffuser bag 11 and the outer wall of the inflation port 21 of the airbag body 20 can be completely sealed and sewn together. Alternatively, the outer wall of the inlet 111 of the diffuser bag 11 and the inner wall of the inflation port 21 of the airbag body 20 can be completely sealed and sewn together. In this way, the gas entering from the inflation port 21 can completely enter the inlet 111 of the diffuser bag 11, flow through the outlet 112 of the diffuser bag 11, and then enter the interior of the airbag body 20, thereby preventing gas with an excessively high flow rate from directly entering the interior of the airbag body 20.

[0035] In addition, as can be seen from the above embodiment, the diffuser bag 11 can be cylindrical in structure, and the diffuser bag 11 can have one inlet 111 and one outlet 112. For example, the outlet 112 can be provided at both ends of the diffuser bag 11 opposite to the inlet 111, thereby forming a single air outlet direction.

[0036] In other embodiments, the diffuser bag 11 may be provided with multiple outlets 112. For example, when the diffuser bag 11 is cylindrical, two outlets 112 may be provided on either side of the diffuser bag 11 (perpendicular to the gas inflation direction), thereby forming two gas outlet directions. Similarly, the outlets 112 may be provided as three outlets 112 according to design requirements, and the three outlets 112 may share a single inlet 111, thereby forming three gas outlet directions.

[0037] Furthermore, the diffuser 10 further includes a blocking portion 12 , which is located inside the diffuser bag 11 .

[0038] Specifically, the barrier portion 12 may be integrally formed with the diffuser bag 11 or may be non-integrally formed. The barrier portion 12 is bendable or foldable and can be folded and stored when the airbag body 20 of the passenger airbag 100 is folded. The barrier portion 12 is located within the diffuser bag 11 and can block the flow rate of gas entering the diffuser bag 11.

[0039] Furthermore, the blocking portion 12 is fixedly connected to the cloth piece opposite to the diffuser bag 11 to block the passage of gas, and the outer wall of the blocking portion 12 and the inner wall of the diffuser bag 11 form a curved and bifurcated air intake channel.

[0040] Specifically, assuming that the diffuser bag 11 is placed in a vertical direction, the direction of the gas entering the diffuser bag 11 (i.e., from the inlet 111 to the outlet 112) is defined as the gas inflation direction, and the gas inflation direction is the vertical direction shown in Figures 3 and 4. The cloth piece opposite to the diffuser bag 11 refers to the cloth piece corresponding to the direction perpendicular to the gas inflation direction, that is, the cloth piece opposite to the vertical direction.

[0041] The front and rear ends of the barrier 12 are fixedly connected to two opposing cloth pieces of the diffuser bag 11. The front end of the barrier 12 is sealed and sewn to the inner wall of the diffuser bag 11, and the rear end of the barrier 12 is sealed and sewn to the inner wall of the diffuser bag 11, thereby preventing gas from passing through the barrier 12 body and the front and rear ends of the barrier 12.

[0042] Therefore, the barrier portion 12 is located within the diffuser pocket 11, and the outer wall of the barrier portion 12 and the inner wall of the diffuser pocket 11 can form a curved and bifurcated air inlet passage. The curved and bifurcated air inlet passage helps reduce the flow rate of gas entering the airbag body 20, reducing the maximum pressure within the airbag 100 during the first 10 milliseconds, and easing the airbag deployment process. This ensures the integrity of the airbag 100 and the surrounding windshield, dashboard, and instrument panel, and facilitates the use of more cost-effective materials.

[0043] It should be noted that the front and rear ends of the blocker are based on the orientation or position relationship when the diffuser bag 11 is placed vertically (as shown in the directions in Figures 3 and 4). This is only for the convenience of describing this embodiment and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0044] In some embodiments, as shown in Figures 2 to 5, the blocking portion 12 includes two columns, and each column of blocking portions 12 includes a plurality of parallel sub-blocking portions 12. The sub-blocking portions 12 extend obliquely from the gas inflation direction of the diffuser bag 11 toward the edge of the diffuser bag 11, so that the blocking portion 12 is trumpet-shaped as a whole.

[0045] When the gas enters the diffuser bag 11 from the inlet 111 of the diffuser bag 11, the trumpet-shaped blocking portion 12 will begin to disperse the flow direction of the gas from the inlet 111 of the diffuser bag 11, causing part of the gas to flow toward the edge of the diffuser bag 11, thereby increasing the path length of the flow of this part of the gas. In addition, this part of the gas will also collide with the edge of the diffuser bag 11 and return, further reducing the flow rate and energy of this part of the gas.

[0046] Furthermore, along a direction perpendicular to the gas inflation direction, the two rows of blocking portions 12 are spaced apart to form a main air intake channel 13; a branch air intake channel 14 is formed between two adjacent sub-blocking portions 12 in each row of blocking portions 12, and multiple branch air intake channels 14 are located on both sides of the main air intake channel 13 and are connected to the main air intake channel 13.

[0047] Specifically, the main air inlet channel 13 formed by the two rows of blocking portions 12 can allow most of the gas to flow from the main air inlet channel 13 through the diffuser bag 11 into the airbag body 20, so as to ensure the required deployment speed of the airbag 100 and protect the passengers.

[0048] 2 to 5 , each column of blocking portions 12 includes three sub-blocking portions 12 . The three sub-blocking portions 12 are arranged in parallel and tilted. The plurality of sub-blocking portions 12 give the blocking portion 12 a multi-layer trumpet-like structure, i.e., a plurality of branch air inlet channels 14 .

[0049] Gas that passes through the first trumpet-shaped structure (or the first branch air inlet channel 14) may enter the second trumpet-shaped structure (or the second branch air inlet channel 14), thereby further reducing the gas flow rate and maximum pressure. Thus, the multiple branch air inlet channels 14 formed by the multiple sub-blocking portions 12 can reduce the gas flow rate and energy multiple times. While ensuring that the airbag 100 deployment time meets the requirements, the gas intake speed in the first 10 milliseconds can be reduced, allowing the airbag body 20 of the airbag 100 to slowly deploy within the first 10 milliseconds, thereby ensuring the integrity of the airbag body 20 of the airbag 100 and other structures such as the instrument panel and windshield.

[0050] In some embodiments, in the gas inflation direction, the sub-blocking portions 12 in the two rows of blocking portions 12 are arranged flush with each other, or may be staggered.

[0051] The flush arrangement means that, as shown in Figures 2 to 5, the sub-blocking portions 12 of one row of blocking portions 12 are flush with the sub-blocking portions 12 of another row of blocking portions 12 along the gas inflation direction. In this way, the blocking force on the gas entering the diffuser bag 11 can be balanced.

[0052] The staggered arrangement means that, perpendicular to the gas inflation direction, the sub-blocking portions 12 of one row of blocking portions 12 are aligned with the branch air inlet channels 14 of another row of blocking portions 12. This can facilitate the entry of gas into the branch air inlet channels 14, accelerate the deceleration of the gas flow rate, and thus reduce the number of blocking portions 12.

[0053] In some embodiments, as shown in FIG. 6 , the end of the blocking portion 12 is circular or elliptical, and the diameter of the end of the blocking portion 12 is greater than the width of the middle portion of the blocking portion 12 , so that the blocking portion 12 is dog-bone shaped.

[0054] The dog-bone-shaped blocking portion 12 can increase the strength of both ends of the blocking portion 12, and also increase the strength of the connection between the two ends of the blocking portion 12 and the diffuser bag 11, so that the blocking portion 12 can withstand the impact force of the gas entering the diffuser bag 11, thereby reducing the occurrence of tearing at the connection between the blocking portion 12 and the diffuser bag 11.

[0055] Furthermore, as shown in Figures 2 to 5 , the sub-blocking portions 12 in each row of blocking portions 12 have the same length, and the ends of the sub-blocking portions 12 in each row are also aligned along the gas inflation direction. The end of each row of sub-blocking portions 12 near the edge of the diffuser bag 11 can be joined to the edge of the diffuser bag 11 or spaced apart from the edge of the diffuser bag 11 (as shown in Figures 2 to 5 ).

[0056] In other embodiments, as shown in FIG. 6 , the sub-blocking portions 12 of each column of blocking portions 12 include short blocking portions 121 and long blocking portions 122 , and the length of the long blocking portions 122 is greater than that of the short blocking portions 121 .

[0057] The long blocking portion 122 is parallel to the short blocking portion 121 and, along the inflation direction, is arranged crosswise with the short blocking portion 121. Furthermore, along the inflation direction, one end of the long blocking portion 122 is flush with one end of the short blocking portion 121, thereby forming a relatively smooth main air inlet passage 13, meeting the deployment time requirements of the airbag body 20 of the airbag 100.

[0058] Further, the other end of the long blocking portion 122 is engaged with the edge of the diffuser bag 11 to block the gas from passing therethrough, and the other end of the short blocking portion 121 is spaced apart from the edge of the diffuser bag 11 .

[0059] Specifically, the other end of the long blocking portion 122 can be sealed with the edge of the diffuser bag 11, that is, the end face, front end and rear end of the other end of the long blocking portion 122 are all sealed with the inner wall of the diffuser bag 11. Therefore, the gas entering the branch air intake channel 14 can only flow in the direction of the main air intake channel 13.

[0060] Because the long blocking portion 122 and the short blocking portion 121 are spaced apart, and a gap is formed between the other end of the short blocking portion 121 and the edge of the diffuser bag 11, and the other end of the adjacent long blocking portion 122 is also sealed to the edge of the diffuser bag 11, the gas entering the branch air inlet channel 14 bypasses the other end of the short blocking portion 121 and enters the other branch air inlet channel 14. As can be seen from the figure, the two adjacent branch air inlet channels 14 on both sides of the short blocking portion 121 are connected, and the two branch air inlet channels 14 are connected, forming a U-shape.

[0061] Therefore, a part of the gas entering the diffuser bag 11 enters the main air intake channel 13 (as shown by arrow D1), and the other part of the gas enters the branch air intake channel 14 (as shown by arrow D2). After the gas entering the branch air intake channel 14 bypasses the other end of the short blocking portion 121, due to the obstruction of the other end of the adjacent long blocking portion 122, the gas enters another branch air intake channel 14, and then flows out from the other branch air intake channel 14 (as shown by arrow D3).

[0062] Furthermore, because each branch air intake channel 14 is connected to the main air intake channel 13 and is arranged at an angle, the direction of gas flowing out of another branch air intake channel 14 is opposite to the direction of gas in the main air intake channel 13. Therefore, the gas flowing out of another branch air intake channel 14 (as shown by arrow D3) blocks the gas in the main air intake channel 13 (as shown by arrow D1), thereby reducing the flow rate of gas in the main air intake channel 13.

[0063] In another embodiment, as shown in Figures 7 and 9, the air inlet passage formed by the outer wall of the barrier portion 12 and the inner wall of the diffuser bag 11 is shaped like a Tesla valve. The Tesla valve-shaped air inlet passage divides the gas entering the diffuser bag 11 into two paths, thereby reducing the flow rate and maximum pressure of the gas entering the diffuser bag.

[0064] In the embodiments shown in Figures 2 to 6, the diffuser bag 11 can be a rectangular cylindrical structure. In the embodiment shown in Figure 7, the diffuser bag 11 can also be a rectangular cylindrical structure, or the diffuser bag 11 can be an S-shaped cylindrical structure (as shown in Figure 9).

[0065] In some embodiments, the diffuser bag 11 may be integrally formed, and the integrally formed diffuser bag 11 is stronger. In this embodiment, the diffuser bag 11 may include a first cloth piece and a second cloth piece, and the edges of the first cloth piece and the second cloth piece are sewn together by sewing thread.

[0066] Furthermore, the middle part (i.e., not the edge) of the first cloth piece and the second cloth piece is sewn by sewing thread to form a blocking portion 12, that is, the blocking portion 12 is sewn by sewing thread, thereby forming a non-expansion area that cannot expand in the middle part of the diffuser bag 11. The blocking portion 12 directly formed by sewing thread has a simple manufacturing structure and low cost, is not easy to be damaged, and has high strength and toughness.

[0067] Based on the same inventive concept, the present disclosure also provides a passenger airbag 100. The specific manner in which the functions implemented in the passenger airbag 100 in the above embodiment have been described in detail in the embodiment of the diffuser 10, and will not be elaborated here.

[0068] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0069] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are merely used to distinguish structures of the same type from one another and do not indicate a particular order or degree of importance. In fact, the expressions "first," "second," and the like are fully interchangeable. For example, a first structure could also be referred to as a second structure, and similarly, a second structure could also be referred to as a first structure without departing from the scope of this disclosure.

[0070] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0071] It is further understood that, unless otherwise specified, “connection” includes a direct connection where there are no other components between the two elements, and also includes an indirect connection where there are other elements between the two elements.

[0072] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0073] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A diffuser (10) for an airbag, characterized in that: include: A diffuser bag (11) is located inside an airbag body (20) of the safety airbag (100), and an inlet (111) of the diffuser bag (11) is fixed at an inflation port (21) of the airbag body (20) and communicated with the inflation port (21) of the airbag body (20); The blocking portion (12) is located inside the diffuser bag (11), The blocking portion (12) is fixedly connected to a cloth sheet opposite to the diffuser bag (11) to block the passage of gas, and the outer wall of the blocking portion (12) and the inner wall of the diffuser bag (11) form a curved and bifurcated air intake passage.

2. The diffuser (10) for an airbag according to claim 1, characterized in that: The blocking portion (12) comprises two rows, each row of the blocking portion (12) comprises a plurality of parallel sub-blocking portions (12), the sub-blocking portions (12) extending obliquely from the gas inflation direction of the diffuser bag (11) toward the edge of the diffuser bag (11), so that the blocking portion (12) is trumpet-shaped as a whole.

3. The diffuser (10) for an airbag according to claim 2, characterized in that: Along a direction perpendicular to the gas charging direction, the two rows of blocking portions (12) are spaced apart to form a main air intake channel (13); A branch air intake channel (14) is formed between two adjacent sub-blocking portions (12) in each row of blocking portions (12), and the branch air intake channel (14) is located on both sides of the main air intake channel (13) and is in communication with the main air intake channel (13).

4. The diffuser (10) for an airbag according to claim 3, characterized in that: In the gas inflation direction, the sub-blocking portions (12) in the two rows of blocking portions (12) are arranged flush with each other.

5. The diffuser (10) for an airbag according to claim 2, characterized in that: The end of the blocking portion (12) is circular, and the diameter of the end of the blocking portion (12) is greater than the width of the middle portion of the blocking portion (12), so that the blocking portion (12) is dog-bone shaped.

6. The diffuser (10) for an airbag according to claim 2, characterized in that: The sub-blocking part (12) of each column of the blocking part (12) comprises: a short blocking portion (121); and a long blocking portion (122), wherein the long blocking portion (122) is parallel to the short blocking portion (121), and crosses the short blocking portion (121) and is arranged at intervals, Wherein, along the gas inflation direction, one end of the long blocking portion (122) is flush with one end of the short blocking portion (121), the other end of the long blocking portion (122) is engaged with the edge of the diffuser bag (11) to block the passage of gas, and the other end of the short blocking portion (121) is spaced from the edge of the diffuser bag (11).

7. The diffuser (10) for an airbag according to claim 1, characterized in that: The air intake passage formed by the outer wall of the blocking portion (12) and the inner wall of the diffuser bag (11) is in the shape of a Tesla valve.

8. The diffuser (10) for an airbag according to claim 1, characterized in that: The diffuser bag (11) comprises a first cloth piece and a second cloth piece, the edges of the first cloth piece and the second cloth piece are sewn by sewing thread, and the middle parts of the first cloth piece and the second cloth piece are sewn by sewing thread to form the blocking part (12).

9. The diffuser (10) for an airbag according to claim 1, characterized in that: The diffuser bag (11) is in the shape of a rectangular tube and is integrally formed.

10. A passenger airbag (100), characterized in that: include: The airbag body (20) includes an inflation port (21); an inflator, wherein an exhaust port of the inflator is connected to the inflation port (21); A diffuser (10) for an airbag according to any one of claims 1 to 9, located inside an airbag body (20) of the airbag (100), wherein an inlet (111) of the diffuser bag (11) is fixed at an inflation port (21) of the airbag body (20) and communicates with the inflation port (21) of the airbag body (20).

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