WO2025092368A1 - Diffuser for airbag and passenger airbag - Google Patents

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

The present invention relates to the technical field of safety airbags, and in particular to a diffuser for a safety airbag and a passenger safety airbag.

Background Art

The gas generator (also called inflator) is used to release gas into the airbag to deploy the airbag. Since the reactive gas in the gas generator is released instantly, the gas flow speed is very fast, resulting in very large mechanical stress or maximum pressure applied by the gas on the airbag in the initial stage of airbag deployment (e.g., the first 10 milliseconds). This is very unfriendly to the integrity of the airbag and the integrity of the car windshield, dashboard, and instrument panel on the dashboard around the airbag.

In the related art, a common diffuser is set at the air inlet of the airbag or the airbag is made of special materials. However, the common diffuser can only ensure the stability and integrity of the airbag when it is inflated, and cannot reduce the airflow speed of the gas generated by the gas generator entering the airbag. Airbags made of special materials often have no advantages and also increase costs.

Summary of the invention

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

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 communicated with 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 therethrough, and an outer wall of the blocking portion and an inner wall of the diffuser bag form a curved and forked air inlet channel.

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.

In some embodiments, along a direction perpendicular to the gas inflation direction, the two columns of the 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 the 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.

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.

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.

In some embodiments, the sub-blocking portion in each column of the blocking portion includes: 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 arranged at intervals, 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 from the edge of the diffuser bag.

In some embodiments, the air intake 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.

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 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 portion.

In some embodiments, the diffuser bag is in a rectangular cylindrical shape and is integrally formed.

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, wherein the exhaust port of the inflator is 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.

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

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.

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

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

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

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

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

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

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

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

FIG. 9 is a pictorial diagram of a diffuser bag according to another exemplary embodiment.

DETAILED DESCRIPTION

Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

In order 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.

The passenger airbag 100 includes an airbag body 20 (as shown in FIG. 1 ), an inflator (not shown) and a diffuser 10. The airbag body 20 is made of a special cloth bag material and can be in an unfolded state or a folded state.

The airbag body 20 includes an inflation port 21, and the inflator has an exhaust port, and the exhaust port of the inflator is connected to the inflation port 21 of the airbag body 20, so as to inflate the airbag body 20 to deploy the passenger airbag 100. It should be noted that the shape of the airbag body 20 in FIG. 1 is only exemplary and is not intended to limit the scope of protection of the present disclosure. In some other embodiments, the shape of the airbag body 20 can be changed according to the needs of the designer and is not specifically limited here.

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 .

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

The diffuser bag 11 is located at the inflation port 21 of the airbag body 20. The diffuser bag 11 may be a cylindrical structure. The diffuser bag 11 may 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 airbag body 20 and is connected to the inflation port 21 of the airbag body 20.

The inlet 111 of the diffuser bag 11 needs to completely wrap 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. 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, so that the gas entering from the inflation port 21 can all enter the inlet 111 of the diffuser bag 11, and then enter the interior of the airbag body 20 after flowing through the outlet 112 of the diffuser bag 11, so as to prevent the gas with too high flow rate from directly entering the interior of the airbag body 20.

In addition, it can be seen from the above embodiments that the diffuser bag 11 can be a cylindrical structure, the diffuser bag 11 can have one inlet 111, and one outlet 112. For example, the outlet 112 is provided at both ends of the diffuser bag 11 opposite to the inlet 111, thereby forming a single air outlet direction.

In some other embodiments, the diffuser bag 11 may be provided with a plurality of outlets 112. For example, when the diffuser bag 11 has a cylindrical structure, two outlets 112 can be respectively set on both sides of the diffuser bag 11 (perpendicular to the gas inflation direction) to form two directions of gas outlet. Similarly, the outlet 112 can also be set as three outlets 112 according to design requirements, and the three outlets 112 can share one inlet 111, and the three outlets 112 form three directions of gas outlet.

Furthermore, the diffuser 10 further includes a blocking portion 12 , and the blocking portion 12 is located inside the diffuser bag 11 .

Specifically, the blocking portion 12 may be integrally formed or non-integrally formed with the diffuser bag 11. The blocking portion 12 may be bent or folded, and can be folded and stored when the airbag body 20 of the passenger airbag 100 is folded. The blocking portion 12 is located in the diffuser bag 11, and the blocking portion 12 in the diffuser bag 11 may block the flow rate of the gas entering the diffuser bag 11.

Furthermore, the blocking portion 12 is fixedly connected to the 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.

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.

The front end and the rear end of the barrier 12 are respectively fixedly connected to two opposite 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, so as to prevent gas from passing through the barrier 12 body and the front end and the rear end of the barrier 12.

Therefore, the blocking portion 12 is located inside the diffuser bag 11, and the outer wall of the blocking portion 12 and the inner wall of the diffuser bag 11 can form a curved and bifurcated air inlet channel. The curved and bifurcated air inlet channel is conducive to reducing the flow rate of the gas entering the airbag body 20, reducing the maximum pressure in the airbag 100 in the first 10 milliseconds, and making the deployment process of the airbag slower, thereby ensuring the integrity of the airbag 100 and the integrity of the windshield, instrument panel and instrument panel around the airbag 100, and facilitating the application of materials with more cost advantages.

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 Figures 3 and 4), which is only for the convenience of describing the present invention. The examples and simplified descriptions are not intended to indicate or imply that the devices or components referred to must have a particular orientation, be constructed, or operate in a particular orientation.

In some embodiments, as shown in Figures 2 to 5, the blocking portion 12 includes two columns, and each column of the blocking portion 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.

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 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.

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 the plurality of 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.

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

In this embodiment, as shown in Figures 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, and the plurality of sub-blocking portions 12 make the blocking portion 12 have a multi-layer trumpet-shaped structure, that is, have a plurality of branch air inlet channels 14.

The gas that passes through the first trumpet-shaped structure (or the first branch air intake channel 14) may enter the second trumpet-shaped structure (or the second branch air intake channel 14), thereby further reducing the flow rate and maximum pressure of the gas. It can be seen that the multiple branch air intake channels 14 formed by the multiple sub-blocking parts 12 can reduce the flow rate and energy of the gas multiple times. Under the condition that the deployment time of the airbag 100 meets the requirements, the air intake speed of the gas in the first 10 milliseconds can be reduced, so that the airbag body 20 of the airbag 100 can be slowly deployed 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 the windshield.

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 arranged staggered.

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.

The staggered arrangement means that, in a direction perpendicular to the gas charging direction, the sub-blocking parts 12 of one row of blocking parts 12 are aligned with the branch air inlet channels 14 of another row of blocking parts 12. In this way, it is more convenient for gas to enter the branch air inlet channels 14, speeding up the deceleration speed of the gas flow rate, thereby reducing the number of blocking parts 12.

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.

The dog-bone-shaped blocking portion 12 can increase the strength of both ends of the blocking portion 12, while also increasing the strength of the connection between the two ends of the blocking portion 12 and the diffuser bag 11, thereby enhancing the ability of the blocking portion 12 to 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.

Further, as shown in Fig. 2 to Fig. 5, the lengths of the sub-blocking parts 12 of each column of blocking parts 12 are the same, and the ends of the sub-blocking parts 12 of each column are also aligned along the gas inflation direction. Among them, one end of each column of sub-blocking parts 12 close to the edge of the diffuser bag 11 can be combined with the edge of the diffuser bag 11, or can be spaced from the edge of the diffuser bag 11 (as shown in Fig. 2 to Fig. 5).

In some 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 .

The long blocking portion 122 is parallel to the short blocking portion 121, and along the gas inflation direction, the long blocking portion 122 and the short blocking portion 121 are arranged crosswise. Furthermore, along the gas inflation direction, one end of the long blocking portion 122 is flush with one end of the short blocking portion 121, so that the main air inlet channel 13 formed is relatively smooth, meeting the deployment time requirement of the airbag body 20 of the airbag 100.

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 .

Specifically, the other end of the long blocking portion 122 and the edge of the diffuser bag 11 can be sealed, that is, the end surface, front end and rear end of the other end of the long blocking portion 122 are all sealed with the inner edge of the diffuser bag 11. The walls are sealed and combined, so the gas entering the branch air intake channel 14 can only flow in the direction of the main air intake channel 13.

Because the long blocking portion 122 and the short blocking portion 121 are arranged at intervals, and the other end of the short blocking portion 121 is spaced apart from the edge of the diffuser bag 11 to form a gap, and the other end of the adjacent long blocking portion 122 is also sealed and combined with the edge of the diffuser bag 11. Therefore, the gas entering the branch air intake channel 14 bypasses the other end of the short blocking portion 121 and enters the other branch air intake channel 14. As can be seen from the figure, the two adjacent branch air intake channels 14 on both sides of the short blocking portion 121 are connected, and the two branch air intake channels 14 are U-shaped after being connected.

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).

Because the branch air intake channels 14 are all connected to the main air intake channel 13, and the branch air intake channels 14 are arranged at an angle, the direction of the gas flowing out of another branch air intake channel 14 is opposite to the direction of the 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) will block the gas in the main air intake channel 13 (as shown by arrow D1), thereby reducing the flow rate of the gas in the main air intake channel 13.

In another embodiment, as shown in Figures 7 and 9, the air inlet 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. 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.

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

In some embodiments, the diffuser bag 11 may be integrally formed, and the integrally formed diffuser bag 11 has greater strength. 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.

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

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

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

It is further understood that the terms "first", "second", etc. are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other, and do not indicate a specific order or importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, a first structure can also be referred to as a second structure, and similarly, a second structure can also be referred to as a first structure.

It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present 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 operated in a specific orientation.

It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

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 The present disclosure does not include the common knowledge or conventional technical means in the technical field which are not disclosed in the present disclosure. The description and the examples are considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

It should be understood that the present disclosure is not limited to the precise structures that have been 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 (10)

A diffuser (10) for an airbag, characterized by comprising: 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. The diffuser (10) for an airbag according to claim 1 is characterized in that the blocking portion (12) includes two rows, each row of the blocking portion (12) includes a plurality of parallel sub-blocking portions (12), and 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. The diffuser (10) for an airbag according to claim 2, characterized in that, along a direction perpendicular to the gas inflation direction, the two rows of blocking portions (12) are spaced apart to form a main air inlet 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). 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. The diffuser (10) for an airbag according to claim 2 is 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. The diffuser (10) for an airbag according to claim 2, characterized in that the sub-blocking portion (12) of each column of the blocking portion (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). The diffuser (10) for an airbag according to claim 1 is 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. The diffuser (10) for an airbag according to claim 1 is 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 portion (12). 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 the diffuser bag (11) is integrally formed. A passenger safety airbag (100), characterized by comprising: 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).