Liquid nitrogen auxiliary type low-temperature high-pressure hydrogen cylinder and using method thereof

Abstract

The invention belongs to the technical field of hydrogen cylinders, and discloses a liquid nitrogen auxiliary type low-temperature high-pressure hydrogen cylinder and a using method thereof.The liquid nitrogen auxiliary type low-temperature high-pressure hydrogen cylinder comprises an inner bottle liner integrated valve, a cylinder body and an outer bottle liner integrated valve which are sequentially arranged from top to bottom; the bottle body comprises an outer bottle body, an inner bottle body, an inner container bottle opening and an outer container bottle opening, the inner bottle body is arranged in the outer bottle body, the outer wall of the inner bottle body is separated from the inner wall of the outer bottle body to form an outer container cavity, the inner container bottle opening is arranged at one end of the outer bottle body and communicated with the inner bottle body, and the outer container bottle opening is arranged at the other end of the outer bottle body and communicated with the outer container cavity; the inner bottle liner pile-up valve is fixedly connected with a bottle opening of the inner liner, the outer bottle liner pile-up valve is fixedly connected with a bottle opening of the outer liner, the inner bottle body and the outer bottle body store vehicle-mounted hydrogen in a high-pressure cryogenic mode, and if collision occurs, liquid nitrogen on the outer layer can dilute the high-pressure hydrogen; the problems that in the prior art, the pressure of hydrogen stored in a hydrogen cylinder is too large, explosion occurs, a heat preservation layer and a pressure bearing layer have function interference, and the hydrogen cylinder cannot work normally are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen cylinders and relates to a liquid nitrogen-assisted low-temperature and high-pressure hydrogen cylinder and a use method thereof. Background Art

[0002] As a zero-carbon energy, hydrogen energy has a series of advantages such as abundant sources and environmental protection and no pollution. It is known as the secondary energy with the most development potential in the 21st century. It is widely used in various fields, and the efficient use of hydrogen energy is of great significance to solving the energy and environmental problems facing the world.

[0003] High-pressure hydrogen storage technology occupies a dominant position in the field of hydrogen energy storage and transportation. This technology not only has a simple equipment structure, but also has relatively low energy consumption in the preparation of compressed oxygen, and the filling and discharge speeds are also fast. These characteristics make it very suitable for the needs of modern energy systems. In the classification of high-pressure hydrogen cylinders, we can mainly divide them into four types: Type I, Type II, Type III and Type IV. Different types of hydrogen cylinders differ in design and performance, making them suitable for different application scenarios.

[0004] Although Type I and Type II hydrogen cylinders meet the basic needs of high-pressure hydrogen storage to a certain extent, their weight-to-volume ratio is relatively large. This means that under the condition of the same hydrogen storage capacity, these two types of hydrogen cylinders require more materials to manufacture, which increases the overall weight and makes it difficult to meet the strict requirements of hydrogen fuel cell vehicles for hydrogen storage density. Type III and Type IV hydrogen cylinders use a more advanced fiber full winding structure. Not only does it reduce the weight-to-volume ratio of the hydrogen cylinder, it also increases the hydrogen storage density per unit mass, so more hydrogen can be stored, thereby improving the endurance of hydrogen fuel cell vehicles.

[0005] The liquid hydrogen storage pressure in hydrogen cylinders is 70-90Mpa. Once the pressure is too high or a collision occurs, it is easy to leak or explode, posing a great safety hazard. At the same time, the insulation layer and pressure-bearing layer in existing hydrogen cylinders are prone to functional interference, and the hydrogen cylinders cannot work normally, leading to accidents. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a liquid nitrogen-assisted low-temperature and high-pressure hydrogen cylinder and a method of using the same. A vacuum opening is provided on the outer shield of the hydrogen cylinder to load insulation material and ensure that the vacuum insulation layer is in a vacuum state. The inner layer of hydrogen and the outer layer of liquid nitrogen are respectively loaded and released using two inlets and outlets to avoid mutual interference, thereby solving the technical problem that safety hazards and accidents may occur in hydrogen cylinders in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder, comprising an inner liner integrated valve, a bottle body, and an outer liner integrated valve which are sequentially arranged from top to bottom; the bottle body comprises an outer bottle body, an inner bottle body, an inner liner bottle mouth and an outer liner bottle mouth, the inner bottle body is arranged inside the outer bottle body, the outer wall of the inner bottle body is separated from the inner wall of the outer bottle body to form an outer liner cavity, the inner liner bottle mouth is arranged at one end of the outer bottle body and communicated with the inner bottle body, and the outer liner bottle mouth is arranged at the other end of the outer bottle body and communicated with the outer liner cavity; the inner liner integrated valve is fixedly connected to the inner liner bottle mouth, and the outer liner integrated valve is fixedly connected to the outer liner bottle mouth.

[0008] Furthermore, the outer bottle body includes an outer bottle liner and a vacuum insulation layer arranged in the outer bottle liner; the vacuum insulation layer is used to fill with insulation material, and the outer bottle liner is fixedly connected to the outer screen liner opening.

[0009] Furthermore, a metal mesh is arranged in the outer chamber, and the outer chamber is used to store liquid nitrogen.

[0010] Furthermore, the inner bottle body includes a gas barrier liner layer, an anti-electrochemical corrosion layer, a carbon fiber winding layer and a glass fiber protective layer bonded in sequence from the inside to the outside; the side of the gas barrier liner layer away from the anti-electrochemical corrosion layer is an inner liner cavity, and the inner liner cavity is used to store hydrogen.

[0011] Furthermore, a vacuum layer opening is provided on one side of the outer liner close to the outer liner bottle mouth; the vacuum layer opening is interconnected with the vacuum insulation layer.

[0012] Furthermore, the inner liner bottle mouth includes a first connecting member, a second connecting member, a third connecting member and a fourth connecting member fixedly connected from top to bottom; the first connecting member is fixedly connected to the outer liner, the second connecting member is fixedly connected to the outer liner cavity and the glass fiber protective layer; the third connecting member is fixedly connected to the anti-electrochemical corrosion layer and the carbon fiber winding layer; the fourth connecting member is fixedly connected to the gas barrier inner liner layer.

[0013] Furthermore, the inner liner integrated valve comprises an integrated valve body, one end of the integrated valve body is provided with a hydrogen outlet pipe, and the other end is provided with a first fixing member, and the hydrogen outlet pipe and the first fixing member are both fixedly connected to the integrated valve body.

[0014] Furthermore, the inner bottle integrated valve also includes a discharge device and a temperature and pressure sensor, the discharge device and the temperature and pressure sensor are relatively arranged on the side wall of the integrated valve body, and a hydrogen filling port is arranged between the discharge device and the temperature and pressure sensor; the discharge device temperature and pressure sensor and the hydrogen filling port are fixedly connected to the integrated valve body.

[0015] Furthermore, an annular groove is provided on the first fixing member, and the annular groove is sealedly connected to the bottle mouth of the inner liner through a sealing member.

[0016] The present invention also provides a method for using a liquid nitrogen-assisted low-temperature and high-pressure hydrogen cylinder. Based on the above-mentioned liquid nitrogen-assisted low-temperature and high-pressure hydrogen cylinder, the method comprises the following steps: connecting the inner liner integrated valve, the bottle body, and the outer liner integrated valve in sequence; when storing hydrogen, first filling the outer liner cavity with low-temperature liquid nitrogen through the outer liner bottle mouth to lower the temperature of the inner bottle body, and then filling the inner bottle body with hydrogen through the inner liner bottle mouth; when in use, the hydrogen in the inner bottle body is flowed through the pipeline through the inner liner bottle mouth into the required equipment.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: The invention discloses a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder. The inner bottle body is a carbon fiber-wound composite gas cylinder that bears high pressure, and the outer bottle body is a heat-insulating gas cylinder. The inner bottle body is based on a type IV high-pressure hydrogen cylinder as a prototype, and is composed of a gas-barrier liner layer, an anti-electrochemical corrosion layer, a carbon fiber winding layer, and a glass fiber protective layer that are sequentially bonded from the inside out. The liner cavity is used to store high-pressure hydrogen. The inner bottle body and the outer bottle body are cryogenically preserved by liquid nitrogen, and the outer bottle body and the inner bottle body are supported by a metal mesh. The liquid nitrogen flows between the metal meshes to play a supporting role, thereby preventing normal operation from being affected by slight collision or tilt.

[0018] The invention discloses a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder. The outer chamber is filled with a heat insulation layer material through a vacuum layer opening and subjected to a vacuum treatment. The outer bottle body serves as a heat preservation layer to ensure that the inner chamber is in a low-temperature environment, thereby preventing the hydrogen cylinder from being in danger due to excessive pressure.

[0019] The present invention discloses a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder. The inner bottle body and the outer bottle body adopt a high-pressure deep-cold method to store vehicle-borne hydrogen. If a collision occurs, the liquid nitrogen in the outer layer can dilute the high-pressure hydrogen to avoid the problem of combustion and explosion. Compared with the existing hydrogen cylinder, while retaining the advantage of large loading capacity of the IV-type high-pressure hydrogen cylinder, the problem of explosion caused by a collision is solved, thereby greatly improving safety.

[0020] The invention discloses a liquid nitrogen-assisted low-temperature and high-pressure hydrogen cylinder. The outer cylinder body adopts a nitrogen filling port and a nitrogen outlet pipe for filling and releasing, the inner cylinder body adopts a hydrogen filling port and a hydrogen outlet pipe for filling and releasing, and a temperature and pressure sensor is arranged on the inner cylinder liner integrated valve to monitor the state of the low-temperature and high-pressure hydrogen in real time; the outer cylinder liner integrated valve is provided with a temperature sensor, a pressure sensor and a hydrogen sensor to monitor the state of the liquid nitrogen and whether there is hydrogen leakage, thereby avoiding mutual interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a liquid nitrogen-assisted low-temperature and high-pressure hydrogen cylinder of the present invention; Figure 2 It is a cross-sectional view of a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder of the present invention; Figure 3is a cross-sectional view of the outer bottle body in an embodiment of the present invention; Figure 4 is a cross-sectional view of an inner screen body in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the inner liner integrated valve in an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the inner bottle opening in an embodiment of the present invention.

[0022] Reference numerals: 1-inner bottle liner integrated valve; 11-integrated valve body; 12-hydrogen outlet pipe; 13-first fixing piece; 131-annular groove; 14-discharge device; 15-temperature and pressure sensor; 16-hydrogen filling port; 2-outer bottle liner integrated valve; 3-outer bottle body; 31-outer bottle liner; 311-vacuum layer opening; 32-vacuum insulation layer; 4-inner bottle body; 41-gas barrier liner layer; 42-anti-electrochemical corrosion layer; 43-carbon fiber winding layer; 44-glass fiber protective layer; 5-inner liner bottle mouth; 51-first connecting piece; 52-second connecting piece; 53-third connecting piece; 54-fourth connecting piece; 6-outer liner bottle mouth; 7-outer liner cavity; 8-inner liner cavity. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] Example 1 The present invention discloses a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder, comprising an inner liner integrated valve 1, a bottle body, and an outer liner integrated valve 2 which are sequentially arranged from top to bottom; the inner liner integrated valve 1 comprises an integrated valve body 11, one end of the integrated valve body 11 is provided with a hydrogen outlet pipe 12, and the other end is provided with a first fixing member 13, and the hydrogen outlet pipe 12 and the first fixing member 13 are both fixedly connected to the integrated valve body 11.

[0025] It also includes a discharge device 14 and a temperature and pressure sensor 15. The discharge device 14 and the temperature and pressure sensor 15 are relatively arranged on the side wall of the integrated valve body 11, and a hydrogen filling port 16 is arranged between the discharge device 14 and the temperature and pressure sensor 15; the discharge device 14, the temperature and pressure sensor 15 and the hydrogen filling port 16 are fixedly connected to the integrated valve body 11.

[0026] Specifically, Figure 5As shown, the inner liner integrated valve 1 is threadedly connected to the inner liner bottle mouth 5, and the inner liner integrated valve 1 includes an integrated valve body 11, a hydrogen outlet pipe 12, a first fixing member 13, a discharge device 14, a temperature and pressure sensor 15, and a hydrogen filling port 16. The hydrogen outlet pipe 12 is arranged at the upper end of the integrated valve body 11, and the first fixing member 13 is arranged at the lower end of the integrated valve body 11. In this embodiment, two annular grooves 131 are arranged on the outer side of the first fixing member 13, and the sealing member is sleeved on the annular groove 131, and is detachably connected to the inner liner bottle mouth 5 to seal the hydrogen, and the sealing member and the annular groove 131 are detachably connected.

[0027] The discharge device 14 and the temperature and pressure sensor 15 are symmetrically installed on the side wall of the integrated valve body 11, and the temperature and pressure sensor 15 detects the state of hydrogen in real time. The hydrogen outlet pipe 12, the first fixing member 13, the discharge device 14, the temperature and pressure sensor 15, and the hydrogen filling port 16 are fixedly installed on the integrated valve body 11. The fixed installation includes welding and detachable connection. The corresponding fixing method is selected according to the actual situation.

[0028] The outer bottle liner integrated valve 2 is similar in structure to the inner bottle liner integrated valve 1. The inner bottle liner integrated valve 1 is installed at the upper end of the bottle body, and the outer bottle liner integrated valve 2 is installed at the lower end of the bottle body. A temperature sensor, a pressure sensor and a hydrogen sensor are provided to monitor the status of nitrogen and whether there is any hydrogen leakage. If it is detected that the nitrogen or hydrogen content in the outer liner cavity 7 reaches 0.1% Vol, that is, when the concentration of hydrogen in the outer liner cavity 7 reaches 0.1%, an automatic alarm is triggered; when the concentration of hydrogen in the outer liner cavity 7 reaches 0.2% Vol or the temperature rises by more than 10°C, nitrogen is actively released to mix with the leaked hydrogen to reduce the hydrogen concentration to below 0.1% Vol.

[0029] like Figure 1 As shown, the bottle body includes an outer bottle body 3, an inner bottle body 4, an inner liner bottle mouth 5 and an outer liner bottle mouth 6, the inner bottle body 4 is arranged inside the outer bottle body 3, the outer wall of the inner bottle body 4 is separated from the inner wall of the outer bottle body 3 to form an outer liner cavity 7, the inner liner bottle mouth 5 is arranged at one end of the outer bottle body 3 and communicates with the inner bottle body 4, and the outer liner bottle mouth 6 is arranged at the other end of the outer bottle body 3 and communicates with the outer liner cavity 7; the inner bottle liner integrated valve 1 is fixedly connected to the inner liner bottle mouth 5, and the outer bottle liner integrated valve 2 is fixedly connected to the outer liner bottle mouth 6.

[0030] Specifically, Figure 2 As shown, the bottle body is formed by nesting an outer bottle body 3 and an inner bottle body 4, the outer bottle body 3 is installed on the outside of the inner bottle body 4, the inner liner bottle mouth 5 is embedded in the bottle body and penetrates the entire bottle body, and the inner liner bottle mouth 5 connects the inner liner cavity 8 with the inner liner integrated valve 1. The outer liner bottle mouth 6 is connected to the outer bottle body 3 as a whole, and connects the outer liner cavity 7 with the outer liner integrated valve 2, wherein the inner liner cavity 8 is used to fill hydrogen, and the outer liner cavity 7 is used to fill liquid nitrogen, and the liquid nitrogen in the outer liner cavity 7 cools and preserves the hydrogen in the inner liner cavity 8 to ensure a low temperature environment.

[0031] The inner liner bottle mouth 5 includes a first connecting member 51, a second connecting member 52, a third connecting member 53 and a fourth connecting member 54 fixedly connected from top to bottom; the first connecting member 51 is fixedly connected to the outer liner 31, the second connecting member 52 is fixedly connected to the outer liner cavity 7 and the glass fiber protective layer 44; the third connecting member 53 is fixedly connected to the anti-electrochemical corrosion layer 42 and the carbon fiber winding layer 43; the fourth connecting member 54 is fixedly connected to the gas barrier inner liner layer 41.

[0032] like Figure 6 As shown, the inner liner bottle mouth 5 is hollow, the cross-sections of the first connecting member 51 and the second connecting member 52 are both circular rings, the outer diameter of the second connecting member 52 is larger than the outer diameter of the first connecting member 51, and the first connecting member 51 and the second connecting member 52 are shoulders for connecting with the outer liner cavity 7. The bottom of the fourth connecting member 54 is in close contact with the gas barrier liner layer 41, and the first connecting member 51, the second connecting member 52, the third connecting member 53 and the fourth connecting member 54 fix the inner liner bottle mouth 5.

[0033] The outer bottle body 3 includes an outer bottle liner 31 and a vacuum insulation layer 32 disposed in the outer bottle liner 31; the vacuum insulation layer 32 is used to fill the insulation material, and the outer bottle liner 31 is fixedly connected to the outer bottle liner opening 6. A vacuum layer opening 311 is disposed on the side of the outer bottle liner 31 close to the outer bottle liner opening 6; the vacuum layer opening 311 is interconnected with the vacuum insulation layer 32. The main function of the vacuum insulation layer 32 is to reduce heat transfer and maintain a low temperature environment of the outer liner cavity 7, and the vacuum insulation layer 32 is always kept in a vacuum state.

[0034] Specifically, Figure 3 As shown, the outer bottle body 3 is composed of an outer bottle liner 31 and a vacuum insulation layer 32. The outer bottle liner 31 is made of high-strength alloy material, and the internal cavity is a vacuum insulation layer 32. A vacuum layer opening 311 is opened on the outside of the outer bottle liner 31. The vacuum layer opening 311 can be used to fill the vacuum layer inside the outer liner cavity 7 with insulation material, and the vacuum layer opening 311 is also used to keep the vacuum insulation layer 32 in a vacuum state. At the same time, the outer bottle liner bottle mouth 6 is integrated with the outer bottle liner 31. Liquid nitrogen is filled by the outer bottle liner integrated valve 2, and flows into the outer liner cavity 7 through the outer bottle liner bottle mouth 6, which plays a role in low-temperature refrigeration of the inner liner cavity 8. At the same time, there is also a metal mesh in the outer liner cavity 7, which plays a supporting role. The metal mesh is a mesh structure with small holes inside. Liquid nitrogen flows through the metal mesh to fill the entire outer liner cavity 7.

[0035] The inner bottle body 4 includes a gas barrier liner layer 41, an anti-electrochemical corrosion layer 42, a carbon fiber winding layer 43 and a glass fiber protective layer 44 bonded in sequence from the inside to the outside; the side of the gas barrier liner layer 41 away from the anti-electrochemical corrosion layer 42 is an inner liner cavity 8, and the inner liner cavity 8 is used to store hydrogen.

[0036] like Figure 4As shown, the inner bottle body 4 is composed of a gas barrier liner layer 41, an anti-electrochemical corrosion layer 42, a carbon fiber winding layer 43 and a glass fiber protective layer 44. The gas barrier liner layer 41 is the innermost layer, which is made of a dense material to prevent the penetration and leakage of high-pressure hydrogen; the second layer is the anti-electrochemical corrosion layer 42, which can effectively prevent the metal from corroding due to chemical or electrochemical reactions under the action of the surrounding medium; the third layer is the carbon fiber winding layer 43, which needs to ensure a certain winding thickness to ensure the high strength, high safety and high reliability of the liner; the outermost layer is the glass fiber protective layer 44, which is a high-strength glass fiber protective layer for protection.

[0037] In summary, the present invention is a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder, the inner bottle body 4 is a carbon fiber-wound composite gas cylinder that carries high pressure, the outer bottle body 3 is a heat-insulating gas cylinder, the inner bottle body is based on the IV-type high-pressure hydrogen cylinder, and is composed of a gas-barrier liner layer 41, an anti-electrochemical corrosion layer 42, a carbon fiber winding layer 43, and a glass fiber protective layer 44 that are bonded from the inside to the outside, and the inner liner cavity 8 is used to store high-pressure hydrogen; the inner bottle body 4 and the outer bottle body 3 are cryopreserved by liquid nitrogen, and are fixed with a metal mesh at the same time. The liquid nitrogen flows between the metal meshes to play a supporting role to avoid affecting normal operation due to slight collisions or tilts. The metal mesh supports the outer bottle body 3 and the inner bottle body 4 to prevent deformation or rupture due to external forces.

[0038] Example 2 The present invention discloses a method for using a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder, comprising the following steps: connecting an inner liner integrated valve 1, a bottle body, and an outer liner integrated valve 2 in sequence; when storing hydrogen, firstly filling low-temperature liquid nitrogen into an outer liner cavity 7 through an outer liner bottle mouth 6 to lower the temperature of an inner bottle body 4, and then filling hydrogen into the inner bottle body 4 through an inner liner bottle mouth 5; when in use, the hydrogen in the inner bottle body 4 is flowed through a pipeline through the inner liner bottle mouth 5 into a required device.

[0039] Specifically, the outer bottle body 3 is clamped with the inner bottle body 4 through the inner bottle mouth 5, the inner bottle integrated valve 1 is connected to the inner bottle mouth 5, and the outer bottle integrated valve 2 is connected to the outer bottle mouth 6. Before use, liquid nitrogen is filled into the outer liner cavity 7 through the outer liner mouth 6. Since the upper end of the outer liner mouth 6 and the lower end of the outer liner cavity 7 are connected to each other, nitrogen enters the outer liner cavity 7. A metal mesh is provided in the outer liner cavity 7. The nitrogen passes through the metal mesh and wraps the outer liner cavity 7, thereby cooling the inner liner cavity 8 and creating conditions for subsequent hydrogen transmission.

[0040] When the temperature of the liquid nitrogen in the outer chamber 7 is low enough, hydrogen is filled into the inner chamber 8. Since the temperature in the inner chamber 8 has been lowered, the gaps between hydrogen molecules will be reduced, so that more hydrogen can be stored. If the hydrogen in the inner chamber 8 is to be transmitted outward, the hydrogen outlet pipe 12 is opened and connected to the pipeline, so that the hydrogen in the inner chamber 8 is transmitted to the vehicle for use.

[0041] The inner bottle body 4 and the outer bottle body 3 use high-pressure deep-cold methods to store vehicle-borne hydrogen. If a collision occurs, the outer layer of liquid nitrogen can dilute the high-pressure hydrogen to avoid combustion and explosion. Compared with existing hydrogen cylinders, while retaining the advantage of large loading capacity of Type IV high-pressure hydrogen cylinders, it also solves the problem of explosion in case of a collision, greatly improving safety. Hydrogen storage combines efficient insulation technology, vacuum treatment, and the heat preservation effect of the outer bottle body 3 to achieve low-temperature environmental control of the inner tank cavity 8, thereby safely storing high-pressure hydrogen. During use and maintenance, it is necessary to pay close attention to the operating status and safety performance of the system to ensure its long-term stable operation and safe driving of the vehicle.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be understood as a limitation on the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

Claims

1. A liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder, characterized in that: It comprises an inner liner integrated valve (1), a bottle body, and an outer liner integrated valve (2) which are arranged in sequence from top to bottom; The bottle body comprises an outer bottle body (3), an inner bottle body (4), an inner liner bottle mouth (5) and an outer liner bottle mouth (6); the inner bottle body (4) is arranged inside the outer bottle body (3); the outer wall of the inner bottle body (4) is separated from the inner wall of the outer bottle body (3) to form an outer liner cavity (7); the inner liner bottle mouth (5) is arranged at one end of the outer bottle body (3) and communicates with the inner bottle body (4); the outer liner bottle mouth (6) is arranged at the other end of the outer bottle body (3) and communicates with the outer liner cavity (7); The inner liner integrated valve (1) is fixedly connected to the inner liner bottle mouth (5), and the outer liner integrated valve (2) is fixedly connected to the outer liner bottle mouth (6).

2. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 1, characterized in that: The outer bottle body (3) comprises an outer bottle liner (31) and a vacuum heat insulation layer (32) arranged in the outer bottle liner (31); the vacuum heat insulation layer (32) is used to fill a heat insulation material, and the outer bottle liner (31) is fixedly connected to the outer shield liner opening (6).

3. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 2, characterized in that: A metal mesh is provided in the outer chamber (7), and the outer chamber (7) is used to store liquid nitrogen.

4. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 3 is characterized in that: The inner bottle body (4) comprises a gas barrier liner layer (41), an anti-galvanic corrosion layer (42), a carbon fiber winding layer (43) and a glass fiber protective layer (44) which are bonded in sequence from the inside to the outside; The side of the gas barrier liner layer (41) away from the anti-electrochemical corrosion layer (42) is an inner liner cavity (8), and the inner liner cavity (8) is used to store hydrogen.

5. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 2, characterized in that: The outer liner (31) is provided with a vacuum layer opening (311) on one side close to the outer liner bottle mouth (6); The vacuum layer opening (311) and the vacuum heat insulation layer (32) are interconnected.

6. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 4, characterized in that: The inner liner bottle mouth (5) comprises a first connecting piece (51), a second connecting piece (52), a third connecting piece (53) and a fourth connecting piece (54) which are fixedly connected from top to bottom; The first connecting piece (51) is fixedly connected to the outer liner (31); the second connecting piece (52) is fixedly connected to the outer liner cavity (7) and the glass fiber protective layer (44); the third connecting piece (53) is fixedly connected to the anti-galvanic corrosion layer (42) and the carbon fiber winding layer (43); and the fourth connecting piece (54) is fixedly connected to the gas barrier inner liner layer (41).

7. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 2, characterized in that: The inner liner integrated valve (1) comprises an integrated valve body (11), one end of the integrated valve body (11) is provided with a hydrogen outlet pipe (12), and the other end is provided with a first fixing member (13), and the hydrogen outlet pipe (12) and the first fixing member (13) are both fixedly connected to the integrated valve body (11).

8. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 7, characterized in that: The inner liner integrated valve (1) further comprises a discharge device (14) and a temperature and pressure sensor (15); the discharge device (14) and the temperature and pressure sensor (15) are arranged on a side wall of the integrated valve body (11) relative to each other, and a hydrogen filling port (16) is arranged between the discharge device (14) and the temperature and pressure sensor (15); The discharge device (14), the temperature and pressure sensor (15) and the hydrogen filling port (16) are fixedly connected to the integrated valve body (11).

9. The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to claim 7, characterized in that: The first fixing member (13) is provided with an annular groove (131), and the annular groove (131) is sealedly connected to the inner liner bottle mouth (5) via a sealing member.

10. A method for using a liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder, characterized in that: The liquid nitrogen-assisted low-temperature high-pressure hydrogen cylinder according to any one of claims 1 to 9 comprises the following steps: Connecting the inner liner integrated valve (1), the bottle body, and the outer liner integrated valve (2) in sequence; When storing hydrogen, low-temperature liquid nitrogen is first charged into the outer liner cavity (7) through the outer liner bottle opening (6) to lower the temperature of the inner bottle body (4), and then hydrogen is charged into the inner bottle body (4) through the inner liner bottle opening (5); When in use, the hydrogen gas in the inner bottle body (4) is flowed through the inner bottle mouth (5) through the pipeline into the required equipment.

Images