Hybrid oxyhydrogen gas generator

Abstract

The invention relates to a mixed oxyhydrogen gas generator. The gas generator comprises a first pressure chamber, a second pressure chamber, a connecting piece and a filter screen, the first pressure chamber and the second pressure chamber are oppositely arranged and are not in contact, and the connecting piece surrounds and is connected to the opposite ends of the first pressure chamber and the second pressure chamber to form a first combustion chamber. The filter screen surrounds the connecting piece, and the two ends of the filter screen are connected to the outside of the first pressure chamber and the outside of the second pressure chamber to form a second combustion chamber. According to the mixed hydrogen-oxygen gas generator, the two-stage combustion chamber is adopted, and the uniformity and sufficiency of combustion and mixing of solid hydrogen storage powder are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas generator, in particular to a mixed hydrogen-oxygen gas generator. BACKGROUND

[0002] The general safety airbag gas generator is divided into two kinds of pyrotechnic and mixed gas generator. Among them, the pyrotechnic is solid fuel combustion to produce a large amount of gas, which is filtered and then rushed into the airbag. The mixed gas generator is mixed with high-pressure gas after solid fuel combustion and is filled into the airbag. At present, there is also a hydrogen-oxygen gas generator, which mixes hydrogen and oxygen and burns to produce a large amount of water vapor into the airbag. However, the compression and welding of hydrogen and oxygen in the manufacturing process is a high-risk operation, and there is also an explosion risk after hydrogen leakage in daily use. In addition, during long-term high-pressure storage of hydrogen, hydrogen embrittlement phenomenon occurs in the metal weld, which reduces the weld strength and further increases the risk of use, so it is not widely used. SUMMARY

[0003] In view of the above problems, the purpose of the present application is to provide a mixed hydrogen-oxygen gas generator, which is applied to the related fields of automobile safety airbag, unmanned aerial vehicle falling airbag, especially to the co-pilot airbag or ceiling airbag with large gas demand, or large airbag for unmanned aerial vehicle falling.

[0004] The technical scheme adopted by the present application is:

[0005] The gas generator comprises a first pressure chamber, a second pressure chamber, a connecting piece and a filter screen. The first pressure chamber and the second pressure chamber are oppositely arranged without contact, are connected at opposite ends of the first pressure chamber and the second pressure chamber by the connecting piece surrounding and connecting the first pressure chamber and the second pressure chamber, and form a first combustion chamber. The filter screen surrounds the connecting piece outside, and is connected at both ends to the first pressure chamber and the second pressure chamber outside, forming a second combustion chamber.

[0006] Further, the mixed hydrogen-oxygen gas generator further comprises a first cylinder and a second cylinder, the first cylinder has the first pressure chamber inside, and the second cylinder has the second pressure chamber inside. The first cylinder and the second cylinder are both transitioned from a large end part to a small end part along the axial direction, and the small end parts of the two are oppositely arranged. The connecting piece is sleeved on the small end parts of the first cylinder and the second cylinder, and the filter screen is sleeved on the large end parts of the first cylinder and the second cylinder.

[0007] Further, the mixed hydrogen-oxygen gas generator, the opposite end of the first pressure chamber is provided with a fuel assembly, and the other end is provided with an ignition assembly. One end of the fuel assembly is provided with an outwardly extending spike needle, and the other end is provided with a fuel cavity containing solid hydrogen storage powder.

[0008] Further, the mixed hydrogen-oxygen gas generator, the fuel assembly includes a cover plate, the solid-state hydrogen storage powder, a disperser, the fuel cavity and the needle; the fuel cavity is connected to the opposite end of the first pressure chamber, the disperser is arranged in the middle of the fuel cavity, one side of the disperser is filled with the solid-state hydrogen storage powder and sealed with the cover plate, the other side of the disperser is provided with the needle;

[0009] Further, the mixed hydrogen-oxygen gas generator, the ignition assembly includes an ignition base, an electric detonation tube, ignition powder and an ignition powder box; the ignition base is connected to the other end of the first pressure chamber, the electric detonation tube is installed on the ignition base, and the ignition powder box containing the ignition powder is buckled on the ignition base through the electric detonation tube.

[0010] Further, the mixed hydrogen-oxygen gas generator, the solid-state hydrogen storage powder is aluminum trihydride, magnesium hydride or a mixture of the two.

[0011] Further, the mixed hydrogen-oxygen gas generator, the first pressure chamber is filled with helium, argon or a mixture of the two, and the filling pressure is 30MPa-60MPa; the second pressure chamber is filled with air with a filling pressure of 30MPa-60Mpa.

[0012] Further, the mixed hydrogen-oxygen gas generator, the opposite end of the second pressure chamber is provided with a bursting disc, and the other end is provided with an inflation assembly.

[0013] Further, the mixed hydrogen-oxygen gas generator, the inflation assembly includes a spring, a plug, a sealing ring, a welded plug and an inflation base; the inflation base is connected to the other end of the second pressure chamber, forms a one-way valve structure with the spring, the plug and the sealing ring, and is sealed outside the inflation base with the welded plug.

[0014] Further, the mixed hydrogen-oxygen gas generator, the connecting piece is a circular tube, and the inner sides of the two ends have internal threads; the small end portions of the first cylinder and the second cylinder have external threads, and the two ends of the connecting piece are connected to the small end portions of the first cylinder and the second cylinder through threads.

[0015] Further, the mixed hydrogen-oxygen gas generator, the filter screen is a multi-layer rolled filter screen, which includes a coarse anti-burning filter screen, a fine pore filter layer and a structure reinforcing layer from inside to outside.

[0016] The above technical solution has the following advantages:

[0017] (1) The mixed hydrogen-oxygen gas generator provided by the application adopts two-stage combustion chambers, thereby improving the uniformity and sufficiency of solid-state hydrogen storage powder combustion and mixing.

[0018] (2) The mixed hydrogen-oxygen gas generator provided by the application adopts single ignition, thereby realizing two combustion processes of ignition powder combustion and aluminum trihydride and oxygen combustion.

[0019] (3) The mixed hydrogen-oxygen gas generator provided by the application replaces high-pressure hydrogen with solid-state hydrogen storage powder, thereby reducing the risk in manufacturing, storage and use, and the combustion product is mainly water vapor, the gas composition is pure, and the environment is friendly. The solid-state hydrogen storage powder has high hydrogen storage density and large hydrogen storage volume, the hydrogen content of aluminum trihydride reaches 10% of the total mass, the hydrogen content of magnesium hydride reaches 7.6% of the total mass, which is 2-3 times higher than that of 70MPa high-pressure gaseous hydrogen and 1.5 times higher than that of liquid hydrogen, and a small amount of solid-state hydrogen storage powder can achieve the effect of high-pressure hydrogen charging.

[0020] (4) The second combustion chamber of the mixed hydrogen-oxygen gas generator provided by the application adopts a one-way valve structure, high-pressure gas is filled first and then welding is performed, thereby improving the welding quality and welding safety.

[0021] (5) The mixed hydrogen-oxygen gas generator provided by the application adopts a combination of solid-state hydrogen storage powder and a filter screen, the powder is attached and combusted in the filter screen, thereby reducing the escape of metal powder and significantly reducing the combustion flame. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic view of the mixed hydrogen-oxygen gas generator provided by an embodiment of the application is shown in the figure.

[0023] Figure 2 The structure schematic view of the first pressure chamber provided by an embodiment of the application is shown in the figure.

[0024] Figure 3 The structure schematic view of the second pressure chamber provided by an embodiment of the application is shown in the figure.

[0025] The figure legend is as follows: 1-first pressure chamber, 11-ignition assembly, 111-ignition base, 112-electric detonation tube, 113-ignition powder, 114-ignition powder box, 12-fuel assembly, 125-cover plate, 126-solid-state hydrogen storage powder, 127-distributor, 128-fuel cavity, 129-needle, 13-first cylinder, 2-second pressure chamber, 21-gas charging assembly, 211-spring, 212-plug, 213-sealing ring, 214-welded plug, 215-gas charging base, 22-bursting disc, 23-second cylinder, 3-connection piece, 4-filter screen, 5-first combustion chamber, 6-second combustion chamber. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be further described in details below with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e. the present application is not limited to the described preferred embodiments, and the scope of the present application is defined by the claims.

[0027] In the description of the present application, it is to be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "first", "second", etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the above terms can be understood in the specific meaning in the present application by the person of ordinary skill in the art according to the specific circumstances.

[0028] Example 1

[0029] Figure 1 The structure schematic diagram of the mixed hydrogen-oxygen gas generator provided for an embodiment of the present application. The gas generator comprises a first pressure chamber 1, a second pressure chamber 2, a connecting piece 3 and a filter screen 4. The first pressure chamber 1 and the second pressure chamber 2 are oppositely arranged without contact, and the end of the first pressure chamber 1 and the second pressure chamber 2 close to each other is the opposite end of each of them, and the end of the first pressure chamber 1 and the second pressure chamber 2 away from each other is the other end of each of them. The two ends of the connecting piece 3 are respectively surrounded and connected to the opposite ends of the first pressure chamber 1 and the second pressure chamber 2, so that the first pressure chamber 1 and the second pressure chamber 2 are connected together and form a first combustion chamber 5, which is a preliminary mixed combustion chamber. The filter screen 4 is surrounded outside the connecting piece 3, and its two ends are connected outside the first pressure chamber 1 and the second pressure chamber 2, forming a second combustion chamber 6, which is a sufficient combustion filter chamber. The first pressure chamber 1 is filled with inert gas, preferably helium, argon or a mixture of the two, to prevent the reaction of solid hydrogen storage material, and the filling pressure is 30MPa-60MPa, and the high-pressure environment reduces the performance of moisture absorption and self-decomposition. The second pressure chamber 2 is filled with air with a pressure of 30MPa-60Mpa.

[0030] Specifically, the gas generator further comprises a first cylinder 13 and a second cylinder 23, the first cylinder 13 has the first pressure chamber 1 therein, and the second cylinder 23 has the second pressure chamber 2 therein. The first cylinder 13 and the second cylinder 23 are both transitioned from a large end portion to a small end portion along an axial direction thereof, the large end portion is a portion with a larger cross-sectional diameter, the small end portion is a portion with a smaller cross-sectional diameter, and a transition portion connects the large end portion and the small end portion. The small end portions of the first cylinder 13 and the second cylinder 23 are oppositely arranged, i.e., the small end portions of the first cylinder 13 and the second cylinder 23 are located at opposite ends thereof. The connector 3 is sleeved on the small end portions of the first cylinder 13 and the second cylinder 23, and end faces of the connector 3, the small end portions of the first cylinder 13 and the second cylinder 23 form the first combustion chamber 5. The filter screen 4 is sleeved on the large end portions of the first cylinder 13 and the second cylinder 23, and the connector 3, the filter screen 4, the transition portions of the first cylinder 13 and the second cylinder 23 form the second combustion chamber 6.

[0031] As shown in Figure 2 , the opposite end of the first pressure chamber 1 is provided with the fuel assembly 12, and the other end is provided with the ignition assembly 11. The fuel assembly 12 is provided with an outwardly extending spike needle 129 at one end and a fuel cavity 128 containing solid-state hydrogen storage powder 126 at the other end.

[0032] Specifically, the fuel assembly 12 includes a cover plate 125, a solid hydrogen storage powder 126, a disperser 127, a fuel cavity 128 and a needle 129. The fuel cavity 128 is connected to the opposite end of the first pressure chamber 1, and the fuel cavity 128 has a large diameter portion, a small diameter portion and a transition portion transitioning from the large diameter portion to the small diameter portion. The disperser 127 is arranged in the middle of the fuel cavity 128, i.e. clamped to the transition portion of the fuel cavity 128. One side of the disperser 127 in the fuel cavity 128 (the large diameter portion of the fuel cavity 128) is filled with the solid hydrogen storage powder 126 and sealed by the cover plate 125 connected to the end of the fuel cavity 128, and the other side of the disperser 127 (the small diameter portion of the fuel cavity 128) is provided with the needle 129 at the end. The needle 129 points to the second pressure chamber 2 but does not contact, and the distance between the needle tip and the bursting disc of the second combustion chamber is 1mm-3mm. The gas generator will undergo high and low temperature changes during storage, and the head of the fuel cavity will deform. The needle has a reserved distance to ensure safety in use. The needle 129 can be integrally formed with the shell of the fuel cavity 128, or can be connected to the end of the shell of the fuel cavity 128 as a separate part. The solid hydrogen storage powder 126 is aluminum trihydride, magnesium hydride or a mixture of the two. The aluminum trihydride is an α crystal form of aluminum trihydride powder, and is coated by atomic layer deposition technology. In order to ensure the safety of the solid hydrogen storage powder, the surface of the solid hydrogen storage powder needs to be coated. The treated aluminum trihydride has more stable performance and prevents decomposition during use and storage. The particle size of the solid hydrogen storage powder 126 is 100um-1000um. Large particle size powder is selected to reduce the precision of the filter screen and improve the gas permeability. The cover plate is preferably made of rubber.

[0033] The ignition assembly 11 includes an ignition base 111, an electric detonator 112, ignition powder 113 and an ignition powder box 114. The ignition base 111 is sealingly connected to the other end of the first pressure chamber 1, and the electric detonator 112 is mounted on the ignition base 111, with its input end extending out of the first pressure chamber 1 and its output end pressed into the ignition powder box 114 and in contact with the ignition powder 113. Specifically, the ignition powder box 114 containing the ignition powder 113 is buckled on the ignition base 111 through the electric detonator 112, and the ignition powder box 114 and the ignition base 111 are welded and sealed. The ignition assembly 11 provides the initial burst energy, and after ignition, high temperature gas and burning metal particles are generated, which push the needle to burst the bursting disc, and at the same time, push the solid hydrogen storage powder to be ejected from the disperser, and the burning metal particles enter the first combustion chamber along with the gas flow to ignite the mixed gas of the solid hydrogen storage powder and air.

[0034] As Figure 3As shown, the opposite end of the second pressure chamber 2 is provided with a burst disc 22, and the other end is provided with an inflation assembly 21. The inflation assembly 21 includes a spring 211, a plug 212, a sealing ring 213, a welded plug 214 and an inflation base 215. The inflation base 215 is sealingly connected to the other end of the second pressure chamber 2, forms a one-way valve structure with the spring 211, the plug 212 and the sealing ring 213, and is sealingly welded with the welded plug 214 outside the inflation base 215. Specifically, the inflation base 215 has a valve cavity with two side openings in the middle, and the plug 212 is arranged in the valve cavity. The spring 211 is abutted between the plug 212 and one side opening in the valve cavity, and the sealing ring 213 is arranged between the plug 212 and the other side opening in the valve cavity. When no force is applied to the plug 212, the plug 212 is abutted to the sealing ring 213 to form a sealing state under the action of the spring 211; when it is necessary to inflate the second pressure chamber 2, the force is applied to the plug 212 through the other side opening, the plug 212 presses the spring 211, and the plug 212 is away from the sealing ring 213 to form an inflation state. After the inflation is completed, the welded plug 214 is welded outside the inflation base 215 to seal the other side opening, further reducing the leakage rate. The one-way valve structure separates the inflation and welding two processes, ensuring the welding quality and safety.

[0035] The connecting piece 3 is a circular tube, and the inner side of both ends thereof has an internal thread. The small end part of the first cylinder 13 and the second cylinder 23 has an external thread, and the both ends of the connecting piece 3 are threadedly connected to the small end part of the first cylinder 13 and the second cylinder 23. The first combustion chamber 5 and the second combustion chamber 6 generate high-pressure gas when combusting, and the thread connection of the connecting piece 3 with the first cylinder 13 and the second cylinder 23 provides sufficient strength.

[0036] The filter screen 4 is a multi-layered rolled filter screen, which includes a coarse anti-ablation filter screen, a fine pore filter layer and a structure reinforcing layer from inside to outside. The inner side of both ends of the filter screen 4 has a round corner matching the shape from the large end part to the transition part of the first cylinder 13 and the second cylinder 23, and the both ends of the filter screen 4 are just clamped at the position of the large end part to the transition part of the first cylinder 13 and the second cylinder 23. Since the particle size of the solid-state hydrogen storage powder is 100-1000 um, and the temperature during combustion is 1000-1350℃, the pressure generated by the second combustion chamber is also high, the inner layer (coarse anti-ablation filter screen) of the filter screen has anti-ablation performance, the middle layer (fine pore filter layer) has good filtering performance and blocks the escape of particles, and the outer side (structure reinforcing layer) has a certain strength to provide support.

[0037] The manufacturing process of the mixed hydrogen-oxygen gas generator is as follows:

[0038] The first step, making the ignition assembly 11: the ignition powder 113 is weighed and loaded into the ignition powder box 114, the input end of the electric detonation tube 112 is loaded into the ignition base 111, the output end is pressed into the ignition powder box 114, the end face of the ignition powder box 114 and the end face of the ignition base 111 are attached, the attached end faces of the ignition powder box and the ignition base are welded, and the production of the ignition assembly is completed.

[0039] The second step, making the fuel assembly 12: the disperser 127 is loaded into the transition position inside the fuel cavity 128, the aluminum foil is pasted on the surface of the disperser 127, the solid-state hydrogen storage powder 126 is filled in the fuel cavity 128 in the glove box, and the cover plate 125 is sleeved. The production of the fuel assembly 12 is completed, and the fuel assembly 12 needs to be placed in the dryer.

[0040] The third step, making the first pressure chamber: the ignition assembly 11 and the fuel assembly 12 are pressed into the two ends of the first cylinder 13 according to the positions shown in the figure, and are welded. Figure 2

[0041] The fourth step, the first pressure chamber inflation welding: the inflation welding machine is used to flush high-pressure inert gas from the small hole on the side of the first cylinder 13, in order to reduce the inflation temperature, the inflation time is designed to be greater than 2 min, the inflation pressure is 50 MPa, and after the inflation is completed, the inflation hole is welded, and the production of the first pressure chamber is completed.

[0042] The fifth step, making the inflation assembly 21: the sealing ring 213 is sleeved into the taper surface of the plug 212, is loaded into the valve cavity of the inflation base 215, the spring 211 is installed at the tail of the plug, the spring 211 is fixed by the inward bending of the inflation base 215, and the installation of the one-way valve structure is completed.

[0043] The sixth step, the second pressure chamber inflation welding: the inflation assembly 21 and the bursting disc 22 are pressed into the two ends of the second cylinder 23 according to the positions shown in the figure, and are welded. The high-pressure air is flushed from the position of the inflation assembly 21 to 50 MPa, after the inflation is completed, the plug 214 is pressed and welded, and the production of the second pressure chamber is completed. Figure 3

[0044] The seventh step, completing the assembly of the mixed hydrogen-oxygen generator: one side of the connecting piece 3 is screwed into the external thread of the first cylinder, the filter screen 4 is sleeved outside the first cylinder. Then the other side of the connecting piece 3 is screwed into the second cylinder, and the filter screen 4 is pressed tightly, and the assembly of the entire gas generator is completed.

[0045] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.​​

Claims

1. A hybrid hydrogen-oxygen gas generator, characterized in that, The gas generator includes a first pressure chamber (1), a second pressure chamber (2), a connector (3), and a filter screen (4); the first pressure chamber (1) and the second pressure chamber (2) are arranged opposite to each other and do not contact each other, and are connected to the opposite ends of the first pressure chamber (1) and the second pressure chamber (2) by the connector (3) to form a first combustion chamber; the filter screen (4) is surrounded by the connector (3), and its two ends are connected to the outside of the first pressure chamber (1) and the second pressure chamber (2) to form a second combustion chamber.

2. The hybrid hydrogen-oxygen gas generator according to claim 1, characterized in that, The gas generator also includes a first cylinder (13) and a second cylinder (23), the first cylinder (13) having a first pressure chamber (1) and the second cylinder (23) having a second pressure chamber (2); the first cylinder (13) and the second cylinder (23) are both transitioned from the large end portion to the small end portion along their axial direction, and the small end portions of the two are arranged opposite to each other; the connector (3) is sleeved on the small end portion of the first cylinder (13) and the second cylinder (23), and the filter screen (4) is sleeved on the large end portion of the first cylinder (13) and the second cylinder (23).

3. A hybrid hydrogen-oxygen gas generator according to claim 1 or 2, characterized in that, A fuel assembly (12) is provided at one end of the first pressure chamber (1), and an ignition assembly (11) is provided at the other end; one end of the fuel assembly (12) is provided with an outwardly extending needle (129), and the other end is provided with a fuel chamber (128) containing solid hydrogen storage powder (126).

4. A hybrid hydrogen-oxygen gas generator according to claim 3, characterized in that, The fuel assembly (12) includes a cover plate (125), the solid hydrogen storage powder (126), a disperser (127), a fuel chamber (128), and a needle (129); the fuel chamber (128) is connected to the opposite end of the first pressure chamber (1), the disperser (127) is disposed in the middle of the fuel chamber (128), one side of the disperser (127) is filled with the solid hydrogen storage powder (126) and sealed with the cover plate (125), and the needle (129) is disposed on the other side of the disperser (127); The ignition assembly (11) includes an ignition base (111), an electric detonator (112), an ignition charge (113), and an ignition charge box (114); the ignition base (111) is connected to the other end of the first pressure chamber (1), the electric detonator (112) is installed on the ignition base (111), and the ignition charge box (114) containing the ignition charge (113) is fastened to the ignition base (111) through the electric detonator (112).

5. A hybrid hydrogen-oxygen gas generator according to claim 3, characterized in that, The solid hydrogen storage powder (126) is aluminum trihydride, magnesium hydride, or a mixture of the two.

6. A hybrid hydrogen-oxygen gas generator according to claim 1 or 2, characterized in that, The first pressure chamber (1) is filled with helium, argon or a mixture of the two, and the filling pressure is 30MPa to 60MPa; the second pressure chamber (2) is filled with air at a pressure of 30MPa to 60MPa.

7. A hybrid hydrogen-oxygen gas generator according to claim 1 or 2, characterized in that, A rupture disc (22) is provided at one end of the second pressure chamber (2), and an inflation assembly (21) is provided at the other end.

8. A hybrid hydrogen-oxygen gas generator according to claim 7, characterized in that, The inflation assembly (21) includes a spring (211), a plug (212), a sealing ring (213), a welded plug (214), and an inflation base (215); the inflation base (215) is connected to the other end of the second pressure chamber (2), and forms a one-way valve structure with the spring (211), the plug (212), and the sealing ring (213), and is sealed on the outside of the inflation base (215) by the welded plug (214).

9. A hybrid hydrogen-oxygen gas generator according to claim 2, characterized in that, The connector (3) is a cylindrical tube with internal threads on the inner sides of both ends. The small ends of the first cylinder (13) and the second cylinder (23) have external threads. The two ends of the connector (3) are connected to the small ends of the first cylinder (13) and the second cylinder (23) by threads.

10. A hybrid hydrogen-oxygen gas generator according to claim 2, characterized in that, The filter screen (4) is a multi-layer rolled filter screen, which includes a coarse anti-burn filter screen, a fine pore filter layer and a structural reinforcement layer from the inside to the outside.

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