An underwater inflatable airbag inflation assist device

Abstract

The application discloses an underwater folding airbag inflation auxiliary device, which comprises an inflation unit, an unfolding mechanism and an airbag. The inflation unit comprises a base and a gas generator. The base is provided with a cavity. The periphery of the base is provided with a plurality of gas outlets which are communicated with the cavity. The gas generator is installed in the cavity. A plurality of unfolding mechanisms are installed on the base. The unfolding mechanism comprises a one-way air guide piece, an extension piece and an inflation nozzle. The one-way air guide piece and the extension piece are both installed on the base and correspond to the gas outlets. The movable end of the extension piece is connected with the inflation nozzle. The one-way air guide piece can guide the gas in the cavity into the extension piece to drive the movable end of the extension piece to move. When the movable end reaches the maximum stroke state, the gas can be discharged through the inflation nozzle. The plurality of air inlets on the periphery of the airbag are respectively communicated with the inflation nozzles of the plurality of unfolding mechanisms. The problem that the airbag is unstable during the unfolding process under water, is easy to be wound, overturned or cannot be inflated in the predetermined shape is solved.

Description

Technical Field

[0001] This invention relates to the field of rescue equipment technology, specifically to an underwater folding airbag inflation auxiliary device. Background Technology

[0002] With the increasing frequency of marine economic activities, maritime accidents are on the rise year by year, among which the search and rescue of people who have fallen overboard has always been a key focus and challenge in maritime emergency rescue. Traditional maritime lifesaving equipment, such as life rings, life rafts, and rope throwing devices, generally rely on the person in the water to grab onto them or cooperate with their actions. However, in actual rescue scenarios, people in the water are often unable to actively cooperate with the rescue due to hypothermia, exhaustion, or confusion, rendering traditional equipment ineffective at critical moments and significantly reducing rescue efficiency and success rates.

[0003] In recent years, with the development of unmanned intelligent equipment technology, underwater rescue systems based on autonomous underwater vehicles (AUVs) have become a research hotspot. By carrying rescue devices such as airbags, AUVs can perform active positioning, approach, and buoyancy rescue underwater, significantly improving the ability to rescue incapacitated people who have fallen into the water.

[0004] However, due to the complexity of the underwater environment, including factors such as water flow disturbances and pressure changes, the deployment and inflation process of airbags underwater faces many technical challenges: airbags have poor stability during underwater deployment, and hydraulic disturbances such as water flow and waves can impact the flexible airbags that are being inflated, causing their deployment trajectory to become uncontrollable. They are prone to entanglement, overturning, or failure to inflate according to the predetermined shape, resulting in insufficient airbag inflation efficiency and reliability; existing technologies mostly use a simple single-point inflation method, which in the underwater environment is prone to causing local bulging and uneven inflation of the airbag, which not only prolongs the inflation time but may also cause the airbag to rupture due to stress concentration. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an underwater folding airbag inflation auxiliary device, which solves the problems of poor stability of airbags during underwater deployment, easy entanglement, overturning, or failure to inflate according to the predetermined shape in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This invention provides an underwater folding airbag inflation assist device, comprising:

[0008] An inflation unit includes a base and a gas generator. The base has a cavity and a plurality of air outlets communicating with the cavity are provided on the periphery of the base. The gas generator is installed in the cavity.

[0009] Multiple opening mechanisms are mounted on the base. Each opening mechanism includes a one-way air guide, a telescopic member, and an inflation nozzle. The one-way air guide and telescopic member are both mounted on the base and correspond to the air outlet. The movable end of the telescopic member is connected to the inflation nozzle. The one-way air guide can guide gas from the cavity into the telescopic member to drive the movable end of the telescopic member to move. When the movable end reaches its maximum stroke, the gas can be discharged through the inflation nozzle.

[0010] The airbag has multiple air inlets around its periphery that are connected to the inflation nozzles of multiple expansion mechanisms.

[0011] In some embodiments, the one-way air guide includes a valve body, a spring, a ball, and a piston block. The valve body has a mounting cavity, and the valve body has an air inlet and an air outlet communicating with the mounting cavity at opposite ends. The inner diameter of the mounting cavity gradually decreases at the end facing the air inlet. The valve body is connected to a base, and the air outlet corresponds to the air outlet hole. The piston block, spring, and ball are all disposed in the mounting cavity. The spring and ball are located on opposite sides of the piston block. The ball has a first state in which it abuts against the inner wall of one end of the mounting cavity to form a closed air inlet, and a second state in which it separates to form an open air inlet.

[0012] In some embodiments, one side of the piston block is provided with a conical groove, and in a first state, the ball also abuts against the inner wall of the conical groove.

[0013] In some embodiments, the telescopic component includes a primary telescopic tube and a secondary telescopic tube, both of which are connected to the base. The secondary telescopic tube is coaxially inserted inside the primary telescopic tube. The movable end of the primary telescopic tube is connected to the inflation nozzle, and the movable end of the secondary telescopic tube is connected to the movable end of the primary telescopic tube. The air inlet of the secondary telescopic tube corresponds to the air outlet. When the secondary telescopic tube pneumatically drives the primary telescopic tube to extend to its maximum stroke, the exhaust port of the secondary telescopic tube can be opened to allow gas from the secondary telescopic tube to enter the primary telescopic tube.

[0014] In some embodiments, the primary telescopic tube includes multiple first tubes with decreasing diameters that are slidably connected together, the first tube with the largest diameter being fixedly connected to the base, and the first tube with the smallest diameter being connected to the inflation nozzle.

[0015] The secondary telescopic tube includes multiple second tubes with decreasing diameters that are slidably connected, a piston rod, and a slider. The second tube with the largest diameter is fixedly connected to the base, and the end of the second tube with the smallest diameter is provided with an exhaust port. One end of the piston rod passes through the second tube with the smallest diameter and is fixedly connected to the slider. The other end of the piston rod is fixedly connected to the end of the first tube with the smallest diameter.

[0016] In some embodiments, the spreading mechanism further includes an arc-shaped baffle, the concave side of which is connected to the inflation nozzle.

[0017] In some embodiments, the nozzle of the inflation nozzle is a flat fan-shaped nozzle.

[0018] In some embodiments, the middle portion of the airbag is also fixedly connected to the base.

[0019] In some embodiments, a gas generating box is fixedly provided in the base, and a plurality of gas dispersing holes are provided circumferentially on the gas generating box, and each of the gas dispersing holes corresponds one-to-one with each of the gas outlet holes. The gas generator is located in the gas generating box, and the valve body is also connected to the gas generating box, and the air inlet corresponds to the gas dispersing hole.

[0020] In some embodiments, the gas generator is a pyrotechnic gas generator.

[0021] Compared with the prior art, the present invention provides an underwater folding airbag inflation auxiliary device, which has a cavity on the base and multiple air outlets connected to the cavity on the periphery of the base. A gas generator is installed in the cavity. Multiple expansion mechanisms are installed on the base. One-way air guides and telescopic components are installed on the base and correspond to the air outlets. The movable end of the telescopic component is connected to the inflation nozzle. The one-way air guide can guide the gas in the cavity into the telescopic component to drive the movable end of the telescopic component to move. When the movable end reaches the maximum stroke state, the gas can be discharged through the inflation nozzle. Multiple air inlets on the periphery of the airbag are respectively connected to the inflation nozzles of multiple expansion mechanisms. After the telescopic component is fully expanded, inflation is automatically started, and multiple inflation nozzles inflate the airbag simultaneously. This can achieve uniform pressure distribution inside the airbag, significantly shorten the inflation time, and ensure that the airbag is inflated efficiently and uniformly under stable support. Attached Figure Description

[0022] Figure 1 This is a reference diagram of the underwater folding airbag inflation assist device provided by the present invention;

[0023] Figure 2 This is a schematic diagram of the unfolded state of an underwater folding airbag inflation assist device provided by the present invention;

[0024] Figure 3 This is a cross-sectional view of an underwater folding airbag inflation assist device provided by the present invention;

[0025] Figure 4 yes Figure 3 Enlarged view of region A in the middle;

[0026] Figure 5yes Figure 3 Enlarged view of region B in the middle;

[0027] Figure 6 yes Figure 3 Enlarged view of region C in the middle;

[0028] Figure 7 This is a schematic diagram of the contracted state of an underwater folding airbag inflation assist device provided by the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] To address the technical problems of poor stability, entanglement, overturning, or failure to inflate to the intended shape during underwater deployment of airbags in existing technologies, this solution provides an underwater folding airbag inflation assist device. This device inflates the airbag along its circumference, ensuring uniform pressure distribution within the airbag to shorten inflation time. It also ensures efficient and uniform inflation of the airbag under stable support, preventing entanglement, overturning, or failure to inflate to the intended shape during inflation.

[0031] Please see Figures 1-7 , Figures 1-7 An underwater folding airbag inflation aid device according to one embodiment of the present invention includes an inflation unit 1, multiple expansion mechanisms 2, and an airbag 3. The inflation unit 1 includes a base 11 and a gas generator 12. The base 11 has a cavity, and multiple air outlets 11a communicating with the cavity are provided on the periphery of the base 11. The gas generator 12 is installed in the cavity. The multiple expansion mechanisms 2 are installed on the base 11. The expansion mechanism 2 includes a one-way air guide 21, a telescopic member 22, and an inflation nozzle 23. One-way air guide 21 and telescopic member 22 are both installed on the base 11 and correspond to the air outlet 11a. The movable end of the telescopic member 22 is connected to the inflation nozzle 23. The one-way air guide 21 can guide the gas in the cavity into the telescopic member 22 to drive the movable end of the telescopic member 22 to move. When the movable end reaches the maximum stroke state, the gas can be discharged through the inflation nozzle 23. The multiple air inlets 211a on the periphery of the airbag 3 are respectively connected to the inflation nozzles 23 of the multiple expansion mechanisms 2.

[0032] It should be noted that the device also includes an intelligent control module (not shown in the figure) encapsulated in a waterproof electrical compartment, which is installed below the base 11. The intelligent control module includes an STM32 series main control chip and a gas generator ignition circuit. The main control chip communicates with the main control system inside the autonomous underwater vehicle through a waterproof connector, receives inflation commands, and controls the gas generator to start.

[0033] In one embodiment, six opening mechanisms 2 are equally spaced around the base 11. The six opening mechanisms 2 can quickly unfold before the airbag is inflated, guide and support the folded airbag, and inflate the airbag 3 simultaneously through six inflation nozzles 23 to ensure uniform pressure distribution inside the airbag. The airbag can stably unfold underwater according to a predetermined shape and trajectory, reduce interference from complex flow field environment, and reduce the impact on the attitude of autonomous underwater vehicle.

[0034] It should be noted that, due to the lack of effective guidance and constraint on the initial shape of the airbag by traditional inflation devices, if the airbag is directly mounted on the autonomous underwater vehicle, the airbag deployment process during inflation is completely passive. The resulting reaction force can easily disturb the autonomous underwater vehicle body, making it greatly affected by the external flow field and significantly impacting the attitude of the autonomous underwater vehicle. It cannot be guaranteed that it can accurately form an effective lifting platform directly below the person falling into the water.

[0035] Based on the above solution, in one embodiment, the expansion mechanism 2 further includes an arc-shaped baffle 24, the concave side of which is connected to the inflation nozzle 23. It can be understood that when the airbag is not yet inflated, the six arc-shaped baffles can constrain the folded airbag, preventing part of the airbag from shifting with the direction of the water flow under the impact of the water flow. This provides a definite deployment path and physical protection for its subsequent inflation, fundamentally solving the problem of unstable airbag deployment in water flow.

[0036] Understandably, when the airbag inflates under the constraint of the six expansion mechanisms 2, the reaction force it experiences as it expands outwards is mainly absorbed and balanced by the six expansion mechanisms 2, and then evenly transmitted to the autonomous underwater vehicle (AUV) through the base. This force transmission is symmetrical and controllable, rather than sudden and unilateral. Therefore, it minimizes disturbances to the AUV, enabling it to maintain a stable hovering position during critical rescue phases, ensuring the accuracy of rescue operations, and also protecting the safety of the AUV itself.

[0037] Furthermore, based on the above scheme, in one embodiment, such as Figure 4As shown, a gas generating box 110 is fixed inside the base 11. A plurality of gas dispersing holes 110a are provided on the gas generating box 110 at intervals along the circumference, and each gas dispersing hole 110a corresponds to each gas outlet hole 11a. At least one gas generator 12 is located inside the gas generating box 110. The valve body 211 is also connected to the gas generating box 110 and the air inlet 211a corresponds to the gas dispersing hole 110a.

[0038] It is understood that the gas generator box 110 is used to collect the high-pressure gas generated by the gas generator and to serve as a container for temporary storage and initial pressure equalization of the gas; the gas generator 12 quickly generates high-pressure gas after receiving the ignition signal, which serves as the gas source for inflating the airbag. In one embodiment, the gas generator 12 is a pyrotechnic gas generator.

[0039] Furthermore, based on the above scheme, in one embodiment, the middle part of the airbag 3 is also fixedly connected to the base 11, which can improve the connection strength of the airbag.

[0040] Furthermore, it should be noted that in one embodiment, the nozzle of the inflation nozzle 23 is a flat fan-shaped nozzle; specifically, the nozzle is designed as a flat fan shape rather than a circle. This design allows the ejected gas to form a wide air curtain, which acts more evenly on the inner wall of the airbag, helping the airbag to open smoothly and evenly, and avoiding local stress concentration.

[0041] Specifically, by simultaneously injecting gas from multiple points around the bottom of the airbag, the internal space of the airbag is filled in a "three-dimensional" manner. This is equivalent to dispersing a large flow rate from a single point into a balanced flow rate from multiple points, allowing the airbag folds to be expanded more quickly and evenly, significantly reducing the risk of damage due to local stress concentration. At the same time, compared with single-channel inflation, the inflation flow rate is theoretically doubled, thereby greatly shortening the total time from starting inflation to forming effective buoyancy, thus giving people who fall into the water a precious chance to survive.

[0042] It should be noted that the one-way air guide 21 is not limited to a specific structure, such as Figure 4 As shown, in one embodiment, the one-way air guide 21 includes a valve body 211, a spring 212, a ball 213, and a piston block 214. The valve body 211 has an installation cavity. At opposite ends of the valve body 211, there are air inlets 211a and exhaust ports 211b communicating with the installation cavity. The inner diameter of the installation cavity gradually decreases at the end facing the air inlet 211a. The valve body 211 is connected to the base 11, and the exhaust port 211b corresponds to the air outlet 11a. The piston block 214, spring 212, and ball 213 are all located in the installation cavity. The spring 212 and ball 213 are located on opposite sides of the piston block 214. The ball 213 has a first state where it abuts against the inner wall of one end of the installation cavity to form a closed air inlet 211a, and a second state where it separates to form an open air inlet 211a.

[0043] Understandably, when the gas pressure inside the gas generating box 110 rises to a certain pressure value, the gas pressure can push the ball 213 to move relative to the valve body 211. The ball 213 separates from the inner wall at one end of the mounting cavity to form the second state of an open air inlet 211a. During the movement, the ball 213 will compress the spring 212. When the gas pressure inside the gas generating box 110 drops to the moving pressure value, the compressed spring 212 will push the ball 213 to move relative to the valve body 211. The ball 213 abuts against the inner wall at one end of the mounting cavity to form the first state of a closed air inlet 211a.

[0044] like Figure 4 As shown, in one embodiment, the piston block 214 is provided with a plurality of through holes along the axial direction of the mounting cavity; in another embodiment, the piston block 214 is provided with a plurality of protrusions spaced apart on its periphery, and the protrusions slide in contact with the inner wall of the mounting cavity, and a flow gap is formed between the piston block 214 and the inner wall of the mounting cavity to ensure that the high-pressure gas entering the mounting cavity through the air inlet 211a can be output through the exhaust port 211b.

[0045] It should be noted that, for example Figure 4 As shown, in one embodiment, the piston block 214 has multiple notches along the axial direction on its periphery, and a flow gap is formed between the multiple notches and the inner wall of the mounting cavity.

[0046] Understandably, when the gas generator 12 generates high-pressure gas, the high-pressure gas can push the ball 213 to move. The ball 213 separates from the inner wall of one end of the mounting cavity to form the second state of an open air inlet 211a. The high-pressure gas can then enter the mounting cavity through the air inlet 211a and be output through the exhaust port 211b. When the gas pressure in the gas generating box 110 decreases, under the action of the spring 212, the piston block 214 pushes the ball 213 to abut against the inner wall of one end of the mounting cavity to form the first state of a closed air inlet 211a, which can stop the inflation of the airbag 3.

[0047] It should be noted that, based on the above scheme, if... Figure 4 As shown, in one embodiment, a conical groove 214a is provided on one side of the piston block 214. In the first state, the ball 213 also abuts against the inner wall of the conical groove 214a.

[0048] It should be noted that the telescopic component 22 is not limited to a specific structure; specifically, such as... Figure 1 , Figure 3 and Figure 4As shown, the telescopic component 22 includes a primary telescopic tube 221 and a secondary telescopic tube 222. Both the primary telescopic tube 221 and the secondary telescopic tube 222 are connected to the base 11, and the secondary telescopic tube 222 is coaxially inserted inside the primary telescopic tube 221. The movable end of the primary telescopic tube 221 is connected to the inflation nozzle 23, and the movable end of the secondary telescopic tube 222 is connected to the movable end of the primary telescopic tube 221. The air inlet of the secondary telescopic tube 222 corresponds to the air outlet 11a. When the secondary telescopic tube 222 pneumatically drives the primary telescopic tube 221 to extend to its maximum stroke state, the exhaust port 211b of the secondary telescopic tube 222 can be opened to allow the gas in the secondary telescopic tube 222 to enter the primary telescopic tube 221.

[0049] Furthermore, in one embodiment, such as Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the first-stage telescopic tube 221 includes multiple first tube bodies 2211 with decreasing diameters that are slidably connected. The first tube body 2211 with the largest diameter is fixedly connected to the base 11, and the first tube body 2211 with the smallest diameter is connected to the inflation nozzle 23. The second-stage telescopic tube 222 includes multiple second tube bodies 2221 with decreasing diameters that are slidably connected, a piston rod 2222, and a slider 2223. The second tube body 2221 with the largest diameter is fixedly connected to the base 11. The end of the second tube body 2221 with the smallest diameter is provided with an exhaust port 211b. One end of the piston rod 2222 passes through the second tube body 2221 with the smallest diameter and is fixedly connected to the slider 2223. The other end of the piston rod 2222 is fixedly connected to the end of the first tube body 2211 with the smallest diameter.

[0050] It is understandable that the second pipe body 2221 with the largest diameter is fixedly connected to the base 11 and corresponds to the gas outlet 11a. The high-pressure gas output through the gas outlet 11a can first enter the second pipe body 2221 with the largest diameter.

[0051] It should be noted that a limiting protrusion is provided on the inner side of one end of the first tube 2211, and an anti-detachment flange is provided on the outer side of the other end of the first tube 2211. An O-ring is fitted on the anti-detachment flange. The two first tubes 2211 can limit the extension stroke and prevent separation by cooperating with the limiting protrusion and the anti-detachment flange, while ensuring coaxial guidance during extension and retraction. Similarly, a limiting protrusion is provided on the inner side of one end of the second tube 2221, and an anti-detachment flange is provided on the outer side of the other end of the second tube 2221.

[0052] Understandably, when high-pressure gas enters the second tube 2221 with the largest diameter, the high-pressure gas can drive the other second tubes 2221 with smaller diameters to move. When the slider 2223 moves to the end of the second tube 2221 with the smallest diameter, the exhaust port 211b can be opened, and the high-pressure gas can enter the first tube 2211 through the exhaust port 211b. The high-pressure gas can be output through the inflation nozzle 23 to inflate the airbag.

[0053] Specifically, the pneumatically operated deployment mechanism completely eliminates the need for a motor drive system and corresponding control circuits, resulting in a more compact and lighter structure when the device is folded up. When not in operation, the device does not increase the drag of the autonomous underwater vehicle. It operates in an instantaneous mode by using a pyrotechnic gas generator, resulting in low overall energy consumption and simple control logic (only requiring "deploy" and "ignition" commands), making operation extremely convenient. This highly integrated and low-power design allows the device to be easily adapted to various autonomous underwater vehicles as a standard functional module, making it highly adaptable and widely applicable.

[0054] To better understand this invention, the following is combined with... Figures 1 to 7 The technical solution of the present invention will be described in detail below:

[0055] In practical use, the base 11 is first connected to the dedicated interface on the belly of the autonomous underwater vehicle (not shown in the figure). The device is then transported to the location where rescue is needed by the autonomous underwater vehicle. After the autonomous underwater vehicle arrives directly below the person who has fallen into the water, the main control system of the autonomous underwater vehicle sends a "execute rescue" command to the intelligent control module of the device. The intelligent control module triggers the gas generator according to the preset program, which causes a large amount of gas to be generated rapidly in the cavity. The gas can be evenly distributed to multiple telescopic components 22 through multiple one-way gas guides 21. The gas can drive the movable end of the telescopic component 22 to move. When the movable end reaches the maximum stroke state, the gas can be discharged through the inflation nozzle 23 to inflate the airbag. The device has a compact structure, stable deployment, rapid response, and minimal impact on the attitude of the autonomous underwater vehicle, which can improve the reliability and practicality of the underwater rescue system.

[0056] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An underwater folding airbag inflation aid device, characterized in that, include: An inflation unit includes a base and a gas generator. The base has a cavity, and the periphery of the base has multiple air outlets communicating with the cavity. The gas generator is installed in the cavity. Multiple opening mechanisms are mounted on the base. Each opening mechanism includes a one-way air guide, a telescopic member, and an inflation nozzle. The one-way air guide and the telescopic member are both mounted on the base and correspond to the air outlet. The movable end of the telescopic member is connected to the inflation nozzle. The one-way air guide can guide gas from the cavity into the telescopic member to drive the movable end of the telescopic member to move. When the movable end reaches its maximum stroke, the gas can be discharged through the inflation nozzle. An airbag, wherein multiple air inlets on the periphery of the airbag are respectively connected to the inflation nozzles of multiple expansion mechanisms; The one-way air guide includes a valve body, a spring, a ball, and a piston block. The valve body has a mounting cavity. The valve body has an air inlet and an air outlet connected to the mounting cavity at opposite ends. The inner diameter of the mounting cavity gradually decreases at the end facing the air inlet. The valve body is connected to the base, and the air outlet corresponds to the air outlet hole. The piston block, spring, and ball are all located in the mounting cavity. The spring and ball are located on opposite sides of the piston block. The ball has a first state where it abuts against the inner wall of one end of the mounting cavity to form a closed air inlet, and a second state where it separates to form an open air inlet.

2. The underwater folding airbag inflation aid device according to claim 1, characterized in that, One side of the piston block is provided with a conical groove, and in the first state, the ball is also in contact with the inner wall of the conical groove.

3. The underwater folding airbag inflation aid device according to claim 1, characterized in that, The telescopic component includes a primary telescopic tube and a secondary telescopic tube, both of which are connected to the base. The secondary telescopic tube is coaxially inserted inside the primary telescopic tube. The movable end of the primary telescopic tube is connected to the inflation nozzle, and the movable end of the secondary telescopic tube is connected to the movable end of the primary telescopic tube. The air inlet of the secondary telescopic tube corresponds to the air outlet. When the secondary telescopic tube pneumatically drives the primary telescopic tube to extend to its maximum stroke, the exhaust port of the secondary telescopic tube can be opened to allow gas inside the secondary telescopic tube to enter the primary telescopic tube.

4. The underwater folding airbag inflation aid device according to claim 3, characterized in that, The first-stage telescopic tube includes multiple first tubes with decreasing diameters that are slidably connected. The first tube with the largest diameter is fixedly connected to the base, and the first tube with the smallest diameter is connected to the inflation nozzle. The secondary telescopic tube includes multiple second tubes with decreasing diameters that are slidably connected, a piston rod, and a slider. The second tube with the largest diameter is fixedly connected to the base, and the end of the second tube with the smallest diameter is provided with an exhaust port. One end of the piston rod passes through the second tube with the smallest diameter and is fixedly connected to the slider. The other end of the piston rod is fixedly connected to the end of the first tube with the smallest diameter.

5. The underwater folding airbag inflation aid device according to claim 1, characterized in that, The opening mechanism also includes an arc-shaped baffle, the concave side of which is connected to the inflation nozzle.

6. The underwater folding airbag inflation aid device according to claim 1, characterized in that, The nozzle of the inflation nozzle is a flat, fan-shaped nozzle.

7. The underwater folding airbag inflation aid device according to claim 1, characterized in that, The middle part of the airbag is also fixedly connected to the base.

8. The underwater folding airbag inflation aid device according to claim 1, characterized in that, A gas generating box is fixed inside the base. The gas generating box has multiple vent holes spaced apart along its circumference, and each vent hole corresponds to each outlet hole. The gas generator is located inside the gas generating box. The valve body is also connected to the gas generating box, and the inlet corresponds to the vent holes.

9. The underwater folding airbag inflation aid device according to claim 1, characterized in that, The gas generator is a pyrotechnic gas generator.

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