Large rubber membrane sealing low-pressure hydrogen storage cabinet

Abstract

The utility model discloses a large rubber membrane sealing low-pressure hydrogen storage cabinet, relates to the technical field of hydrogen storage, and aims to solve the problems that high-pressure hydrogen storage is high in cost, low in safety and short in service life, and the conventional low-pressure hydrogen storage tank needs to be improved. A piston is movably arranged in a cabinet body and vertically moves along the interior of the cabinet body, the upper end of the piston is used for placing balancing weights of different weights to adjust pressure, a flexible rubber sealing film is connected to the inner periphery of the lower portion of the inner wall of the cabinet body in a sealed mode, and the other end of the flexible rubber sealing film is connected with the piston in a sealed mode. A cavity below the flexible rubber sealing film is a hydrogen storage cavity, the side face, located below the flexible rubber sealing film, of the cabinet body is connected with a gas inlet pipe and a gas outlet pipe, and the center distance between the two connecting ends of the flexible rubber sealing film is not smaller than the vertical distance between the upper end in the cabinet body and the gas inlet pipe and the gas outlet pipe. The high-pressure storage tank is simple and reasonable in structure, low in cost, easy to achieve safety and sealing performance, and obviously superior to a high-pressure storage tank in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen storage, in particular to a large rubber membrane sealed low-pressure hydrogen storage cabinet. Background Art

[0002] Hydrogen energy is an ideal clean energy with huge development potential. How to store hydrogen conveniently and efficiently has become an urgent problem to be solved in the field of hydrogen storage. According to the different forms of hydrogen, there are currently main hydrogen storage technologies such as solid hydrogen storage, low-temperature liquid hydrogen storage, high-pressure gaseous hydrogen storage and organic liquid hydrogen storage, each with its own characteristics and scope of application. Among them, high-pressure gaseous hydrogen storage is currently the most widely used hydrogen storage technology.

[0003] Currently, widely used metal materials, especially high-strength materials that can be used to manufacture high-pressure containers, will be affected by hydrogen embrittlement when in contact with hydrogen for a long time, that is, a significant reduction in strength and plasticity, as well as hydrogen-induced delayed fracture under low stress, which is generally referred to as hydrogen embrittlement or hydrogen damage. The existence of hydrogen embrittlement risk may cause hydrogen storage tanks to fail. In addition, the flammable and explosive properties of hydrogen can easily cause fires, explosions and even major disasters. Therefore, hydrogen storage, especially high-pressure hydrogen storage, has high requirements for storage tank conditions, which directly leads to problems such as high hydrogen storage costs, low safety, and short tank life, which seriously restricts the development of hydrogen energy utilization.

[0004] The utility model patent with announcement number CN218378952U and name of a hydrogen low-pressure buffer tank discloses a tank body with a special base and support plate connection structure for improving the stability of the tank body. However, the tank body is mainly used to buffer the pressure fluctuations of the system in various systems to make the system work more smoothly, and is not suitable for long-term storage of hydrogen. In addition, due to the low pressure of the low-pressure storage, it is impossible to rely on its own pressure for transportation. The existing low-pressure hydrogen storage tank still needs to be equipped with an additional power device to guide the hydrogen transportation. In summary, a large rubber membrane sealed low-pressure hydrogen storage cabinet is urgently needed to solve this problem. Utility Model Content

[0005] The utility model aims to provide a large rubber membrane sealed low-pressure hydrogen storage cabinet to solve the problems of high cost, low safety and short storage tank life of high-pressure hydrogen storage, and the existing low-pressure hydrogen storage tanks need to be improved.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a large-scale rubber membrane sealed low-pressure hydrogen storage cabinet, including a cabinet body, a piston movably arranged inside the cabinet body, the piston moves vertically along the inside of the cabinet body, and the upper end of the piston is used to place counterweights of different weights to adjust the pressure. A flexible rubber sealing membrane is sealedly connected to the inner periphery of the lower inner wall of the cabinet body, and the other end of the flexible rubber sealing membrane is sealed to the piston. The cavity below the flexible rubber sealing membrane is a hydrogen storage cavity, and the side of the cabinet body located below the flexible rubber sealing membrane is connected to an air inlet pipe and an air outlet pipe, and the center distance between the two connecting ends of the flexible rubber sealing membrane is not less than the vertical distance from the upper end of the cabinet body to the air inlet pipe and the air outlet pipe.

[0007] Preferably, the piston and the flexible rubber sealing membrane have at least two working states. In the first working state, the piston is located at the upper end of the cabinet, and the flexible rubber sealing membrane is stretched taut all around; in the second working state, the piston is located in the middle of the cabinet, and the lower end of the flexible rubber sealing membrane is loosely stacked on the bottom of the cabinet; or a bracket is provided at the bottom of the cabinet, and in the second working state, the lower end of the flexible rubber sealing membrane is loosely stacked on the bracket; or in the second working state, the middle part of the flexible rubber sealing membrane is suspended below the two connecting ends.

[0008] Preferably, a sliding connection portion is provided between the piston and the cabinet, which includes a plurality of sliding frames distributed in a circular array along the outer circumference of the piston, each group of sliding frames includes a pair of sliding members respectively fixed on the piston and the inner wall of the cabinet, and the two sliding members are slidably connected.

[0009] Preferably, a cabinet top is provided at the upper end of the cabinet body, and a cabinet bottom is provided at the lower end, both of which have the same shape as the piston, wherein a plurality of operating holes are opened on the cabinet top for hanging counterweight blocks and / or maintenance.

[0010] Preferably, the air inlet pipe and the air outlet pipe are both connected with a safety relief pipe, and the lower part of the hydrogen storage chamber is also connected with an emergency relief pipe.

[0011] Preferably, the cabinet body, cabinet bottom and cabinet top are made of composite materials, which are divided into three layers: outer, middle and inner. The middle layer is a cold-bent steel plate, the outer layer is a reinforced fiber layer, and the inner layer is bonded with a fluororubber layer for sealing.

[0012] Preferably, the material of the flexible rubber sealing membrane is fluororubber tape for aviation kerosene internal floating roof storage tanks.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The large rubber membrane sealed low-pressure hydrogen storage cabinet has a simple and reasonable structure. It adopts the form of low-pressure storage, and the sealing and safety are easier to achieve. The requirements for equipment materials can be further reduced, and the cost is relatively low, avoiding the disadvantages of high-pressure storage, high cost, low safety, and short tank life.

[0015] 2. This large rubber membrane sealed low-pressure hydrogen storage cabinet adopts the method of setting a flexible hydrogen storage cavity inside the cabinet, so that the hydrogen pressure can be adaptive to a certain extent during the air intake and exhaust process, and will not cause excessive burden on the cabinet body, thereby further indirectly improving the service life of the overall equipment.

[0016] 3. The large rubber membrane sealed low-pressure hydrogen storage tank can use the counterweight block above the piston to adjust the pressure, thereby realizing a purely mechanical gas outlet power supply with low cost and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure: 1. cabinet body; 2. cabinet bottom; 3. cabinet top; 4. piston; 5. flexible rubber sealing membrane; 6. sliding connection; 7. air inlet pipe; 8. air outlet pipe; 9. safety relief pipe; 10. emergency relief pipe. DETAILED DESCRIPTION

[0019] A large rubber membrane sealed low-pressure hydrogen storage cabinet comprises a cabinet body 1, inside which a piston 4 is movably arranged, the piston 4 moves vertically along the inside of the cabinet body 1, and the upper end of the piston 4 is used to place counterweights of different weights to adjust the pressure, a flexible rubber sealing membrane 5 is sealedly connected to the inner periphery of the lower inner wall of the cabinet body 1, the other end of the flexible rubber sealing membrane 5 is sealedly connected to the piston 4, the cavity below the flexible rubber sealing membrane 5 is a hydrogen storage cavity, the side of the cabinet body 1 located below the flexible rubber sealing membrane 5 is connected to an inlet pipe 7 and an outlet pipe 8, and the center distance between the two connecting ends of the flexible rubber sealing membrane 5 is not less than the vertical distance from the upper end of the inside of the cabinet body 1 to the inlet pipe 7 and the outlet pipe 8.

[0020] For the length of the flexible rubber sealing film 5, reference can be made to the specific accessible position of the piston 4. For example, the piston 4 and the flexible rubber sealing film 5 have at least two working states. In the first working state, the piston 4 is located at the upper end of the interior of the cabinet 1 (the uppermost end that the piston 4 can reach is not necessarily close to the top of the cabinet 1, and may be blocked by a counterweight or a movable part), and the flexible rubber sealing film 5 is stretched tight all around; in the second working state, the piston 4 is located in the middle of the cabinet 1, and the lower end of the flexible rubber sealing film 5 is loosely stacked on the bottom of the cabinet 1; or a bracket is provided at the bottom of the cabinet 1, and in the second working state, the lower end of the flexible rubber sealing film 5 is loosely stacked on the bracket; or in the second working state, the middle part of the flexible rubber sealing film 5 is suspended below the two connecting ends;

[0021] In addition, as for the specific method of sealingly connecting the other end of the flexible rubber sealing membrane 5 with the piston 4, the flexible rubber sealing membrane 5 can be a tube with both ends open after being unfolded, or it can be a bowl with only one end open. Regardless of the form, there can be multiple connection parts with the piston 4, such as the lower end face, the outer periphery, the upper end face, etc. The specific method of fixed connection can also be any form as long as it does not destroy the sealing performance, such as bonding, clamping, or even the entire piston 4 is covered in the bowl-shaped flexible rubber sealing membrane 5, etc. The sealing connection method between the inner periphery of the lower part of the inner wall of the cabinet 1 and the flexible rubber sealing membrane 5 can also adopt a similar connection method as mentioned above.

[0022] When there is no hydrogen stored in the hydrogen storage chamber, the piston 4 is located at the bottom. When the hydrogen storage chamber gradually takes in gas and reaches a certain pressure, the piston 4 begins to rise, and the loose or stacked flexible rubber sealing film 5 begins to roll and pull upward. As the gas continues to enter, the piston 4 rises to the top, the flexible rubber sealing film 5 is straightened upward, and the hydrogen storage chamber reaches the maximum gas storage capacity. When the gas cabinet delivers gas to the outside, the process is the opposite of the above process;

[0023] The specific way in which the piston 4 is movably arranged inside the cabinet 1 can refer to the following structure. A sliding connection part 6 is also arranged between the piston 4 and the cabinet 1, which includes a plurality of sliding frames distributed in a circular array along the outer circumference of the piston 4, and each group of sliding frames includes a pair of sliding parts respectively fixed on the piston 4 and the inner wall of the cabinet 1, and the two sliding parts are slidably connected; of course, the specific way of movable arrangement can also adopt other existing structures.

[0024] The upper end of the cabinet body 1 is provided with a cabinet top 3, and the lower end is provided with a cabinet bottom 2, both of which have the same shape as the piston 4, for example Figure 1 As shown, they are all spherical shapes that bulge upward. This arrangement has the following advantages. First, the piston 4 needs to bear the pressure of the counterweight, and the spherical surface is not easy to deform. Second, the cabinet bottom 2 and the piston 4 are kept at equal distances at all places, and the pressure of the piston 4 is relatively uniform when it moves. Third, the cabinet top 3 and the piston 4 are kept at equal distances at all places, which is conducive to the average arrangement of the counterweight; of course, if the cabinet top 3 and the piston 4 are used, the pressure of the counterweight is relatively uniform. Figure 1 In the shape shown, the lower end of the cabinet bottom 2 is preferably a solid foundation; in addition, a plurality of operating holes may be provided on the cabinet top 3 for hanging counterweights and / or maintenance.

[0025] In a preferred embodiment, the air inlet pipe 7 and the air outlet pipe 8 are both connected with a safety relief pipe 9, and the specific connection method is conventional prior art, which can be referred to in Figure 1The safety relief pipe 9 is generally arranged behind the valves and instrument measuring points of the pipeline, and is used for rear-end relief when monitoring is abnormal; in addition, an emergency relief pipe 10 can be connected to the lower part of the hydrogen storage chamber, which is used to deal with special situations in the hydrogen storage chamber. Similarly, according to the direction of the air flow, the temperature, pressure safety measuring points and the safety valve group are generally set on the pipe first, and then the relief outlet is connected. The existing gas relief pipe structure is generally applicable.

[0026] In order to better deal with hydrogen leakage and hydrogen embrittlement, the materials of the cabinet body 1, cabinet bottom 2 and cabinet top 3 are all made of composite materials, which are divided into three layers: outer, middle and inner. The middle layer is a cold-bent steel plate, the outer layer is a reinforced fiber layer, and the inner layer is bonded with a fluororubber layer for sealing.

[0027] As for the material of the flexible rubber sealing membrane 5, it needs to be able to bend with the movement of the piston 4 and be able to seal hydrogen. For reference, fluororubber tape material for aviation kerosene floating roof storage tanks can be selected, such as the fluororubber sealing bags for aromatics-resistant and aviation kerosene-resistant internal floating roof storage tanks jointly developed by Shanghai Rubber Products Research Institute and Shanghai Rubber Products Factory No. 4, which have the advantages of good softness, good wear resistance, good airtightness, and high mechanical strength, and can be well applied to this low-pressure hydrogen storage cabinet; the flexible rubber sealing membrane 5 can of course also be made of other materials, such as fluororubber modified by organic materials, as long as it meets the requirements of flexibility and airtightness to hydrogen, it can be used, while the composite materials of nitrile rubber + PVC used in traditional industrial gas cabinets cannot meet the sealing requirements of hydrogen.

[0028] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

[0029] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Large rubber membrane sealed low-pressure hydrogen storage cabinet, characterized by: The invention comprises a cabinet (1), wherein a piston (4) is movably arranged inside the cabinet (1), wherein the piston (4) moves vertically inside the cabinet (1), wherein the upper end of the piston (4) is used to place counterweights of different weights to adjust the pressure, wherein a flexible rubber sealing film (5) is sealedly connected to the inner periphery of the lower inner wall of the cabinet (1), wherein the other end of the flexible rubber sealing film (5) is sealedly connected to the piston (4), wherein the cavity below the flexible rubber sealing film (5) is a hydrogen gas storage cavity, wherein the side of the cabinet (1) located below the flexible rubber sealing film (5) is connected to an air inlet pipe (7) and an air outlet pipe (8), wherein the center distance between the two connection ends of the flexible rubber sealing film (5) is not less than the vertical distance from the upper end of the cabinet (1) to the air inlet pipe (7) and the air outlet pipe (8).

2. The large rubber membrane sealed low-pressure hydrogen storage cabinet according to claim 1 is characterized in that: The piston (4) and the flexible rubber sealing membrane (5) have at least two working states. In the first working state, the piston (4) is located at the upper end of the cabinet (1), and the flexible rubber sealing membrane (5) is stretched tight all around. In the second working state, the piston (4) is located in the middle of the cabinet (1), and the lower end of the flexible rubber sealing membrane (5) is loosely stacked on the bottom of the cabinet (1). Alternatively, a bracket is provided at the bottom of the cabinet (1), and in the second working state, the lower end of the flexible rubber sealing membrane (5) is loosely stacked on the bracket. Alternatively, in the second working state, the middle of the flexible rubber sealing membrane (5) is suspended in the air below the two connection ends.

3. The large rubber membrane sealed low-pressure hydrogen storage cabinet according to claim 1 is characterized in that: A sliding connection part (6) is also provided between the piston (4) and the cabinet (1), comprising a plurality of groups of sliding frames distributed in a circular array along the outer circumference of the piston (4), each group of sliding frames comprising a pair of sliding members respectively fixed on the piston (4) and the inner wall of the cabinet (1), and the two sliding members are slidably connected.

4. The large rubber membrane sealed low-pressure hydrogen storage cabinet according to claim 1 is characterized in that: The cabinet body (1) is provided with a cabinet top (3) at the upper end and a cabinet bottom (2) at the lower end, both of which have the same shape as the piston (4), wherein a plurality of operating holes are provided on the cabinet top (3) for hanging counterweight blocks and / or maintenance.

5. The large rubber membrane sealed low-pressure hydrogen storage cabinet according to claim 1 is characterized in that: The air inlet pipe (7) and the air outlet pipe (8) are both connected to a safety relief pipe (9), and the lower part of the hydrogen storage chamber is also connected to an emergency relief pipe (10).

6. The large rubber membrane sealed low-pressure hydrogen storage cabinet according to claim 4 is characterized in that: The cabinet body (1), cabinet bottom (2) and cabinet top (3) are all made of composite materials and are divided into three layers: outer, middle and inner. The middle layer is a cold-bent steel plate, the outer layer is a reinforced fiber layer, and the inner layer is bonded with a fluororubber layer for sealing.

7. The large rubber membrane sealed low-pressure hydrogen storage cabinet according to claim 1 or 2, characterized in that: The material of the flexible rubber sealing membrane (5) is fluorine rubber tape used in aviation kerosene internal floating roof storage tanks.

Images