Constant pressure release air bag structure

Abstract

The invention discloses a constant-pressure release air bag structure. The air bag structure comprises an air bag, an air inlet valve, a plurality of blasting openings, a high-pressure air cylinder and a starting valve. Wherein the air inlet valve and the plurality of blasting openings are arranged on the air bag, the blasting openings are covered with the constant-pressure release connecting pieces, the edges of the constant-pressure release connecting pieces are connected with the air bag through the constant-pressure blasting adhesive tape, the high-pressure air cylinder is connected with the air bag through the air inlet valve, and the starting valve is connected with the high-pressure air cylinder. The aircraft landing impact can be effectively reduced, personnel safety is guaranteed, and the aircraft recovery success rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft buffer structures, and in particular to a constant-pressure release airbag structure. Background Art

[0002] When an aircraft makes an emergency landing, the overload generated during the emergency descent from high altitude will exceed the physiological pressure limit of the personnel, causing casualties. Currently, aircraft are often equipped with parachutes to slow down and reduce the load. However, due to the packaging volume provided by some aircraft, the load reduction limit of the parachute is restricted, and the aircraft cannot reduce the overload to a safe range at the moment of landing. Summary of the invention

[0003] The main purpose of the present invention is to provide a constant-pressure release airbag structure for reducing the impact of an aircraft during landing and avoiding casualties and aircraft damage caused by impact overload.

[0004] The technical solution adopted by the present invention is: a constant pressure release airbag structure, characterized in that it includes: an airbag, an air intake valve, multiple bursting holes, a high-pressure gas cylinder, and a starting valve; wherein the air intake valve and multiple bursting holes are arranged on the airbag, and the upper cover of the bursting hole is provided with a constant pressure release connecting piece, the edge of the constant pressure release connecting piece is connected to the airbag through the constant pressure bursting tape, the high-pressure gas cylinder is connected to the airbag through the air intake valve, and the starting valve is connected to the high-pressure gas cylinder. Furthermore, when the aircraft equipped with the structure is ready to land, the starting valve is opened, and the high-pressure gas cylinder inflates the airbag into shape. After the airbag contacts the ground, the bag pressure continues to increase. When it reaches the bursting pressure of the constant pressure bursting tape, the constant pressure bursting tape explodes to form a bursting hole, and the gas in the bag is gradually discharged from the bursting hole, so as to achieve a cushioned landing of the aircraft.

[0005] Preferably, the airbag is composed of a plurality of special-shaped pieces uniformly arranged along the circumferential direction, and the inner surfaces of the interfaces between the special-shaped pieces are heat-sealed with inner rubber strips, and the outer surfaces are heat-sealed or cold-glued with outer rubber strips.

[0006] Preferably, the constant-pressure release connecting piece is circular; the larger the diameter of the constant-pressure release connecting piece, the smaller the pressure required for explosion; the more the constant-pressure release connecting pieces are, the faster the exhaust speed of the airbag is.

[0007] Preferably, when the diameter of the airbag is 1090mm-1110mm and the breaking strength of the constant pressure bursting tape is 50N / 25mm-70N / 25mm, the relationship between the diameter of the constant pressure release connecting piece and the bursting strength of the airbag includes: When the diameter of the constant-pressure release connecting piece is 290mm-310mm, the bursting strength of the airbag is 7.8kPa-8.2kPa; when the diameter of the constant-pressure release connecting piece is 325mm-345mm, the bursting strength of the airbag is 4.0kPa-4.8kPa; when the diameter of the constant-pressure release connecting piece is 370mm-390mm, the bursting strength of the airbag is 3.5kPa-3.9kPa.

[0008] Preferably, the higher the strength of the constant-pressure blasting tape, the greater the pressure required for blasting.

[0009] Preferably, when the diameter of the airbag is 790mm-810mm and the diameter of the bursting hole is 290mm-310mm, the relationship between the breaking strength of the constant pressure release connecting piece and the bursting strength of the airbag includes: When the breaking strength of the constant pressure release connecting piece is 88N / 25mm-112N / 25mm, the bursting strength of the airbag is 17kPa-20kPa; when the breaking strength of the constant pressure release connecting piece is 140N / 25mm-142N / 25mm, the bursting strength of the airbag is 23kPa-28kPa; when the breaking strength of the constant pressure release connecting piece is 50N / 25mm-70N / 25mm, the bursting strength of the airbag is 7kPa-10kPa; when the breaking strength of the constant pressure release connecting piece is 85N / 25mm-90N / 25mm, the bursting strength of the airbag is 15kPa-18kPa.

[0010] Preferably, the strength of the constant-pressure blasting tape is lower than the strength of the special-shaped cut piece.

[0011] Preferably, the structure further comprises an air filling and deflation valve for detecting and maintaining the airbag, wherein the air filling and deflation valve is connected to the inner surface of the special-shaped cut piece and communicates with the air inlet valve.

[0012] Preferably, the air inlet valve and the high-pressure gas cylinder are connected via a high-pressure hose.

[0013] Preferably, the starting valve comprises an electric control valve and an ignition switch arranged at the mouth of the high-pressure gas cylinder, and the electric control valve is connected to the ignition switch via a wire; The ignition switch generates an electrical signal, which is transmitted via a wire to the electronically controlled valve of the high-pressure gas cylinder, controlling the electronically controlled valve to start the high-pressure gas cylinder to inflate the airbag.

[0014] The beneficial effects produced by the present invention are: 1. The present invention provides a constant pressure release airbag structure, which includes an airbag with a bursting hole. After the aircraft lands and touches the ground, the pressure of the pre-filled airbag increases instantly until it reaches the bursting strength of the bursting hole, causing it to burst. The bursting hole releases gas, reduces the airbag pressure, and achieves a cushioned landing of the aircraft. Compared with traditional parachutes that are easily insufficiently unloaded due to volume limitations, the airbag of the present invention has a more adequate cushioning function, can reduce the overload of the aircraft during landing to a safer range, more effectively protects personnel safety, and improves the success rate of aircraft recovery.

[0015] 2. The airbag of the present invention is composed of special-shaped pieces connected together. The special-shaped pieces are made of materials with relatively high strength and are connected by two layers of inner and outer adhesive strips, thereby ensuring the airtightness of the airbag and the strength of the part other than the bursting hole, and preventing the main material of the airbag from being torn when the constant-pressure bursting tape bursts, causing the gas in the bag to be rapidly released and the buffer to fail.

[0016] 3. The present invention can adjust the bag pressure required for blasting by adjusting the material strength of the constant-pressure blasting tape and the diameter of the constant-pressure release connecting piece, and can also adjust the exhaust speed during airbag blasting by adjusting the number of constant-pressure release connecting pieces, so that this structure can meet more application needs and application scenarios.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a structural diagram of a constant pressure release airbag according to an embodiment of the present invention; Figure 2 is a top view of a constant pressure release airbag structure according to an embodiment of the present invention; Figure 3 is a cross-sectional view of the structure of the connection of the special-shaped cutting piece according to an embodiment of the present invention; Figure 4 is a cross-sectional view of a blasting hole structure of an embodiment of the present invention; Figure 5 It is a flowchart of the work flow of the constant pressure release airbag structure of an embodiment of the present invention.

[0020] Figure numerals: 1. airbag; 2. inner rubber strip; 3. outer rubber strip; 4. charging and discharging valve; 5. constant-pressure release connecting piece; 6. constant-pressure blasting tape; 7. air intake valve; 8. high-pressure hose; 9. high-pressure gas cylinder; 10. ignition switch; 11. wire. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] It should be noted that the illustrations provided in the embodiments of the present invention are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout type may also be more complicated.

[0023] In the present invention, it is also necessary to explain that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application 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, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first" and "second" appear, they are only used for description and distinction purposes, and cannot be understood as indicating or implying relative importance.

[0024] Example 1 This embodiment provides a constant pressure release airbag structure, such as Figure 1 As shown, it includes a ring-shaped airbag 1 composed of 8 identical special-shaped pieces connected together, an air intake valve 7, a plurality of bursting holes composed of a constant-pressure bursting tape 6 and a constant-pressure release connecting piece 5, a high-pressure gas cylinder 9 and an ignition switch 10.

[0025] The air bag 1 is provided with an air inlet valve 7 and a plurality of bursting holes, such as Figure 4 As shown, the edge of the constant pressure release connecting piece 5 is connected to the airbag 1 through the constant pressure bursting tape. While ensuring the airtightness of the airbag 1, the constant pressure bursting tape 6 becomes a weak point of the airbag 1 due to its relatively low strength. When the bag pressure exceeds the bearing capacity of the constant pressure bursting tape 6, the constant pressure bursting tape 6 breaks, forming a bursting hole on the airbag 1, thereby achieving constant pressure bursting. The intake valve 7, the high pressure gas cylinder 9, and the ignition switch 10 are connected in sequence.

[0026] When the aircraft equipped with this structure is ready to land, the ignition switch 10 is started, and the high-pressure gas cylinder 9 inflates the airbag 1 into shape. At the moment the airbag 1 touches the ground, the rapidly increasing bag pressure causes the constant-pressure blasting tape 6 to explode, and the blasting hole connects the inside of the airbag 1 with the outside world. The gas in the bag is gradually discharged from the blasting hole, thereby achieving a cushioned landing of the aircraft.

[0027] Furthermore, if Figure 2 As shown, the special-shaped pieces are evenly arranged along the circumferential direction and are interconnected to form a ring-shaped airbag 1. The special-shaped pieces are made of high-strength double-sided coated polyurethane tape.

[0028] Furthermore, if Figure 3 As shown, the connection method of the special-shaped pieces includes: heat-sealing an inner rubber strip 2 on the inner surface of the interface of the special-shaped pieces to ensure the airtightness of the airbag, and heat-sealing or cold-bonding an outer rubber strip 3 on the outer surface to ensure the strength of the airbag and further ensure the airtightness.

[0029] Furthermore, the constant pressure release connecting piece 5 is circular, which is convenient for uniform explosion, and the size of the constant pressure release connecting piece 5 is the same as the size of the explosion hole. The larger the diameter of the constant pressure release connecting piece 5, the smaller the pressure required for explosion. The more the number of the constant pressure release connecting pieces 5, the faster the exhaust speed of the airbag 1.

[0030] Furthermore, the constant-pressure blasting tape 6 is made of low-strength knitted cloth coated with thermoplastic polyurethane on one side, and the breaking strength of the knitted cloth determines the airbag blasting strength. The higher the breaking strength, the greater the airbag blasting strength.

[0031] Furthermore, the strength of the constant-pressure blasting tape 6 is lower than the strength of the special-shaped cut piece.

[0032] Furthermore, the structure also includes an inflation and deflation valve 4 for detecting and maintaining the airbag 1, the inflation and deflation valve 4 is connected to the inner surface of the special-shaped cut piece and is communicated with the air inlet valve 7, and the inflation and deflation valve 4, the air inlet valve 7 and the inner surface of the airbag are all connected by a gluing process.

[0033] Furthermore, the air inlet valve 7 and the high-pressure gas cylinder 9 are connected via a high-pressure hose 8 .

[0034] Furthermore, the mouth of the high-pressure gas cylinder 9 is provided with an electric control valve, and the electric control valve is connected to the ignition switch 10 via a wire 11; The ignition switch 10 generates an electrical signal, which is transmitted to the electric control valve of the high-pressure gas cylinder 9 via the wire 11, and controls the electric control valve to start the high-pressure gas cylinder 9 to inflate the airbag 1.

[0035] On the premise of easy implementation, the annular airbag 1 in this embodiment can be replaced with other shapes to meet the landing cushioning requirements of different aircraft in different scenarios.

[0036] Example 2 This embodiment provides a landing cushioning method for an aircraft, and the execution of this method is based on the constant pressure release airbag structure in Embodiment 1.

[0037] like Figure 5 As shown, when the aircraft is about to land, the power ignition switch 10 is turned on, and the electrical signal is transmitted to the electronically controlled valve of the high-pressure gas cylinder 9 through the wire 11. After receiving the electrical signal, the electronically controlled valve can start to release the gas in the high-pressure gas cylinder 9, and inflate the airbag through the high-pressure hose 8.

[0038] At the moment the airbag 1 touches the ground, the impact causes the bag pressure to rise sharply. When the pressure inside the airbag 1 reaches the breaking strength of the constant-pressure blasting tape 6, the constant-pressure blasting tape 6 explodes, and the constant-pressure release connecting piece 5 detaches from the airbag 1, forming a blasting hole on the airbag 1. The gas in the bag is quickly discharged, so that the bag pressure is slowly reduced, and the aircraft lands cushioned.

[0039] Example 3 This embodiment provides a constant-pressure release airbag structure, which has the same airbag structure composition as that in Embodiment 1, except that the diameter of the airbag 1 in this embodiment is set to 1090-1110 mm, and the breaking strength of the constant-pressure blasting tape 6 is 50N / 25mm-70N / 25mm.

[0040] The airbag 1 was subjected to an airdrop test, and the relationship between the diameter of the constant pressure release connecting piece 5 and the bursting strength of the airbag 1 is shown in Table 1.

[0041]

[0042] Table 1 Relationship between the diameter of the constant pressure release connecting piece and the bursting strength of the airbag Example 4 This embodiment provides a constant-pressure release airbag structure, which has the same composition as the airbag structure in Embodiment 1 or 3, except that the diameter of the airbag 1 in this embodiment is set to 790-810 mm, and the diameter of the constant-pressure release connecting piece 5 is set to 290-310 mm.

[0043] The airbag 1 was subjected to an inflation test, and the relationship between the breaking strength of the constant pressure bursting tape 6 and the bursting strength of the airbag 1 is shown in Table 2.

[0044]

[0045] Table 2 Relationship between the breaking strength of constant pressure bursting tape and the bursting strength of airbag Example 5 This embodiment provides an aircraft, which is equipped with the constant pressure release airbag structure described in Embodiment 1 at the bottom.

[0046] In summary, the present invention provides a constant-pressure release airbag structure, which can relieve overload impact by releasing pressure by bursting the airbag when the aircraft lands, more effectively protecting the safety of personnel on the aircraft and improving the success rate of aircraft recovery.

[0047] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0048] The order of execution of each step in the above embodiment does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0049] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A constant pressure release airbag structure, characterized in that: include: An air bag (1), an air inlet valve (7), a plurality of burst holes, a high-pressure gas cylinder (9), and a starting valve; The air inlet valve (7) and the plurality of bursting holes are arranged on the airbag (1); a constant pressure release connecting piece (5) is provided on the upper cover of the bursting hole; the constant pressure release connecting piece (5) is connected to the airbag (1) via the constant pressure bursting tape; the high pressure gas cylinder is connected to the airbag via the air inlet valve (7); and the starting valve is connected to the high pressure gas cylinder (9).

2. The constant pressure release airbag structure according to claim 1, characterized in that: The airbag (1) is composed of a plurality of shaped pieces uniformly arranged along the circumferential direction, wherein the inner surfaces of the interfaces between the shaped pieces are provided with a heat-sealed inner rubber strip (2), and the outer surfaces are provided with a heat-sealed or cold-adhesive outer rubber strip (3).

3. The constant pressure release airbag structure according to claim 1, characterized in that: The constant pressure release connecting piece (5) is circular; the larger the diameter of the constant pressure release connecting piece (5), the smaller the pressure required for explosion; and the greater the number of the constant pressure release connecting pieces (5), the faster the exhaust speed of the airbag (1).

4. The constant pressure release airbag structure according to claim 3, characterized in that: When the diameter of the airbag is 1090 mm-1110 mm and the breaking strength of the constant pressure bursting tape (6) is 50 N / 25 mm-70 N / 25 mm, the relationship between the diameter of the constant pressure release connecting piece (5) and the bursting strength of the airbag (1) includes: When the diameter of the constant pressure release connecting piece (5) is 290 mm-310 mm, the bursting strength of the airbag (1) is 7.8 kPa-8.2 kPa; when the diameter of the constant pressure release connecting piece (5) is 325 mm-345 mm, the bursting strength of the airbag (1) is 4.0 kPa-4.8 kPa; when the diameter of the constant pressure release connecting piece (5) is 370 mm-390 mm, the bursting strength of the airbag (1) is 3.5 kPa-3.9 kPa.

5. The constant pressure release airbag structure according to claim 1, characterized in that: The higher the strength of the constant-pressure blasting tape (6), the greater the pressure required for blasting.

6. The constant pressure release airbag structure according to claim 5, characterized in that: When the diameter of the airbag (1) is 790 mm-810 mm and the diameter of the bursting hole is 290 mm-310 mm, the relationship between the breaking strength of the constant pressure release connecting piece (5) and the bursting strength of the airbag (1) includes: When the breaking strength of the constant pressure release connecting piece (5) is 88N / 25mm-112N / 25mm, the bursting strength of the airbag (1) is 17kPa-20kPa; when the breaking strength of the constant pressure release connecting piece (5) is 140N / 25mm-142N / 25mm, the bursting strength of the airbag (1) is 23kPa-28kPa; when the breaking strength of the constant pressure release connecting piece (5) is 50N / 25mm-70N / 25mm, the bursting strength of the airbag (1) is 7kPa-10kPa; when the breaking strength of the constant pressure release connecting piece (5) is 85N / 25mm-90N / 25mm, the bursting strength of the airbag (1) is 15kPa-18kPa.

7. The constant pressure release airbag structure according to claim 2, characterized in that: The strength of the constant-pressure blasting tape (6) is lower than the strength of the special-shaped cut piece.

8. The constant pressure release airbag structure according to claim 2, characterized in that: The structure also includes an air filling and deflation valve (4) for detecting and maintaining the airbag (1); the air filling and deflation valve (4) is connected to the inner surface of the special-shaped cut piece and is in communication with the air inlet valve (7).

9. The constant pressure release airbag structure according to claim 1, characterized in that: The air inlet valve (7) and the high-pressure gas cylinder (9) are connected via a high-pressure hose (8).

10. The constant pressure release airbag structure according to claim 1, characterized in that: The starting valve comprises an electrically controlled valve and an ignition switch (10) arranged at the mouth of a high-pressure gas cylinder (9), wherein the electrically controlled valve is connected to the ignition switch (10) via a wire (11); The ignition switch (10) generates an electrical signal, which is transmitted to the electric control valve of the high-pressure gas cylinder (9) via the wire (11), and controls the electric control valve to start the high-pressure gas cylinder (9) to inflate the airbag (1).

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