High-pressure hydrogen storage container manufacturing method and high-pressure hydrogen storage container structure

Abstract

The invention discloses a high-pressure hydrogen storage container manufacturing method and a high-pressure hydrogen storage container structure. Compared with a pressure container with a single-layer end socket and a single-layer cylinder or a multi-layer cylinder structure, a pressure container with a structure of a multi-layer end socket, a connecting ring and a multi-layer binding laminate is adopted, so that higher pressure bearing capacity is ensured; the connecting ring has a secondary reinforcing effect on the joint of the outer sealing head and the outer layer plate, so that the stress is better; and due to the design of the connecting rings, stress concentration caused by discontinuous structures of the whole seal head, the inner cylinder and the multiple layers of laminates can be avoided.

Description

Technical Field

[0001] The present invention belongs to the field of high-pressure hydrogen storage in petrochemical and hydrogen energy industries, and in particular relates to a method for manufacturing a high-pressure hydrogen storage container and a high-pressure hydrogen storage container structure. Background Art

[0002] The manufacturing method and structure of high-pressure hydrogen storage containers are the safety guarantee and important carrier for carrying the internal hydrogen medium. The rationality of the structure and its manufacturing method not only affects the safe and long-term operation of the equipment under high-pressure hydrogen environment, but also affects the economic efficiency of the equipment. The structure and its manufacturing method achieve the effect of leakage but no explosion of the hydrogen storage container. The unequal thickness connection of the cylinder and the hemispherical head solves the structural discontinuity problem when the cylinder and the head are connected. The structure and its manufacturing method are compact, have good force resistance, and have good economic and social benefits.

[0003] The head connection structure of the prior art usually has a pressure vessel structure that uses a single head to connect with a single-layer cylinder or a gas cylinder structure that uses a weld-free structure. When the pressure of the single head and single-layer cylinder structure is too high, the thickness of the single-layer head and the cylinder is too thick, it is difficult to form, the manufacturing cost is high, and the structure of the weld between the head and the cylinder section changes suddenly, and the force is not good; the gas cylinder structure is limited by its own structure, material selection and its unique manufacturing method, and there is no way to achieve large-capacity storage requirements. In addition, since the above two structures are single-layer structures, once the material or weld has defects, it will cause internal storage hydrogen to leak and cause safety accidents. There are also cylinders that use multiple layers, and a single head is connected to a multi-layer cylinder. Although it can meet the connection strength requirements, the thickness of the single-layer head is still limited because it must match the thickness of the cylinder, and the thickness of a single head is too thick, which will make it difficult to form. The reason is that the head stamping equipment is not capable enough, the head material characteristics are not satisfactory, and other factors. In this case, if the hydrogen storage container is required to have a higher pressure, the existing technology cannot meet it.

[0004] The above-mentioned single-layer head and cylinder structure has the following disadvantages: (1) The structure is limited by the working pressure of the hydrogen storage container. When the container pressure is too high, the single-layer head and the single-layer cylinder are too thick, difficult to form, and have high manufacturing costs. (2) The structure of the single-layer head and the single-layer cylinder joint weld is suddenly changed, and the force is not good; at the same time, due to the limitations of its own structure and material selection, there is no way to achieve large-capacity storage requirements. (3) Once corrosion and leakage occur inside the single-layer pressure vessel structure or gas cylinder structure, the safety of the head and the cylinder is poor. Summary of the invention

[0005] (1) Technical problem to be solved: The hydrogen storage containers manufactured by the prior art cannot meet the requirements of higher pressures. The present invention provides a method for manufacturing a high-pressure hydrogen storage container and a high-pressure hydrogen storage container structure that has a simple structure, good force bearing capacity, high safety, and excellent economy and can withstand higher pressures.

[0006] (2) The technical solution adopted by the present invention is as follows: A method for manufacturing a high-pressure hydrogen storage container, the high-pressure hydrogen storage container includes an inner cylinder, a layer plate, a connecting ring, an external head, an internal head and a connecting pipe, and the manufacturing process of the high-pressure hydrogen storage container is as follows: Step 1: Make the internal head. The top of the internal head is a spherical head, and the end straight edge is a cylindrical structure. A plate is heated and directly stamped. After stamping, the end is flanging and straightened to make a flat end of the head. After hot stamping, a hole is opened on the top of the internal head. The size of the hole matches the size of the pipe. A stepped step is processed on the end face of the end where the end straight edge of the internal head is located. Step 2: Make an external head. The top of the external head is a spherical head, and the end straight edge is a cylindrical structure. A plate is heated and directly stamped. After stamping, the end is flanging and straightened to make a flat end of the head. After hot stamping, a hole is opened on the top of the external head. The size of the hole matches the size of the pipe. A stepped step is processed on the end face of the end where the end straight edge of the external head is located. The external head is sleeved on the internal head, and the maximum gap between the inner surface of the external head 4 and the outer surface of the internal head is less than 0-2mm. A leak detection hole with a hole size of φ4-φ8 is processed on the external head. Step 3: Make a connecting ring and connect it to the external head. The connecting ring is processed by forging, and the end step and the arc shape of the external head are processed. After processing and forming, the connecting ring is set on the outer surface of the external head. The maximum gap between the inner surface of the connecting ring and the outer surface of the external head is less than 0-2mm. The end face of the larger opening of the connecting ring is processed with a stepped step. The stepped steps on the internal head, external head and connecting ring are continuous. Step 4: Make the inner cylinder and the layer plate. The layer plate includes multiple, Step 5: The seams between the external head and the connecting ring, the seams between the external head and the internal head, the seams between the connecting pipe and the internal head, and the seams between the connecting pipe and the external head are welded, and two assemblies consisting of the external head, the connecting ring, the internal head and the connecting pipe are set. Step 6: The inner cylinder is located between two groups of assemblies consisting of external heads, connecting rings, internal heads and connecting pipes. The two ends of the inner cylinder are welded to the corresponding internal heads respectively. The concentricity of the inner cylinder and the internal heads must be ensured, and the misalignment at the connection between the two is less than the corresponding regulations. The layers are wrapped layer by layer on the inner cylinder. The layers close to the inner cylinder are welded to the inner cylinder and the internal heads. The gap between the inner surface of the layer and the outer surface of the inner cylinder should be less than 3mm. The subsequent layers need to be wrapped layer by layer and welded with the internal heads, external heads, connecting rings and stepped steps at the corresponding positions. The misalignment at the connection is less than 1mm, and the gap between adjacent layers should be less than 3mm.

[0007] A further technical solution is to process an exhaust hole with an opening size of φ4 to φ8 on the connecting ring.

[0008] A high-pressure hydrogen storage container structure includes an inner cylinder, both ends of the inner cylinder are fixedly connected with an internal head, the internal head is sleeved and fixed with an external head, the external head is sleeved and fixed with a connecting ring, the ends of the internal head and the external head are both provided with openings, a pipe is fixed in the opening, a leak detection hole is provided on the external head, and a plurality of layers of plates are sleeved on the inner cylinder, and the layers are fixed to the internal head, the external head and the connecting ring at corresponding positions.

[0009] A further technical solution is that an exhaust hole is provided on the connecting ring.

[0010] (3) Due to the adoption of the above technical solution, the beneficial effects of the present invention are: The pressure vessel of the present invention adopts a structure of multi-layer head + connecting ring + multi-layer wrapped layer plate. Compared with the pressure vessel of the structure of single-layer head and single-layer cylinder or multi-layer cylinder, it has the advantages of being easy to form while ensuring higher pressure bearing capacity. The connecting ring has a secondary strengthening effect on the connection between the external head and the outer layer plate, and the force is better. The design of the connecting ring can also avoid the stress concentration caused by the structural discontinuity between the whole head and the inner cylinder and the multi-layer plate. The present invention provides a leak detection hole structure on the external head. Once corrosion leakage occurs inside the internal head, the external leak detection hole will discharge the leaked medium in time to prevent the head from being damaged and causing an explosion. This structure achieves the effect of only leaking but not exploding, ensuring the safe operation of the equipment.

[0011] The connection structure between the head and the cylinder of the high-pressure hydrogen storage container of the present invention has better stress resistance, a simple and reliable manufacturing method, convenient processing and molding of parts during manufacturing, and easy control of molding quality, which reduces the manufacturing difficulty, saves costs, and shortens the manufacturing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 Enlarged view of the middle part of the structure. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions 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.

[0014] like Figure 1 and Figure 2 shown.

[0015] A high-pressure hydrogen storage container structure includes an inner cylinder 1, both ends of the inner cylinder 1 are fixedly connected to an inner head 5, an outer head 4 is sleeved and fixed on the inner head 5, a connecting ring 3 is sleeved and fixed on the outer head 4, both ends of the inner head 5 and the outer head 4 are provided with openings, a pipe 6 is fixed in the opening, a leak detection hole 7 is provided on the outer head 4, and a multi-layer plate 2 is sleeved on the inner cylinder 1, and the plate 2 is fixed to the inner head 5, the outer head 4, and the connecting ring 3 at corresponding positions. The connecting ring 3 is provided with an exhaust hole 8.

[0016] A method for manufacturing a high-pressure hydrogen storage container, the high-pressure hydrogen storage container includes an inner cylinder, a layer plate, a connecting ring, an external head, an internal head and a connecting pipe, and the manufacturing process of the high-pressure hydrogen storage container is as follows: Step 1: Make the internal head. The top of the internal head is a spherical head, and the straight edge of the end is a cylindrical structure. A piece of plate is heated and directly stamped. After stamping, the end is flanging and straightened to make a flat end of the head. After hot stamping, a hole is opened on the top of the internal head. The size of the hole matches the size of the pipe. A stepped step is processed on the end face of the end where the straight edge of the end of the internal head is located to control the tolerance.

[0017] Step 2: Make an external head. The top of the external head is a spherical head and the end straight edge is a cylindrical structure. A piece of plate is heated and directly stamped. After stamping, the end is flanging and straightened to make a flat end of the head. After hot stamping, a hole is opened on the top of the external head. The hole size matches the size of the pipe. A stepped step is processed on the end face of the end where the end straight edge of the external head is located. The external head is sleeved on the internal head, and the maximum gap between the inner surface of the external head and the outer surface of the internal head is less than 0-2mm. A leak detection hole with an opening size of φ4-φ8 is processed on the external head. The leak detection hole is realized by drilling a hole on the external head.

[0018] Step 3: Make a connecting ring and connect it to the external head. The connecting ring is processed by forging to form an end step and an arc shape of the external head. After processing and forming, the connecting ring is sleeved on the outer surface of the external head. The maximum gap between the inner surface of the connecting ring and the outer surface of the external head is less than 0 to 2 mm. The end face of the larger opening of the connecting ring is processed with a stepped step. The stepped steps on the internal head, external head and connecting ring are continuous. An exhaust hole with an opening size of φ4 to φ8 is processed on the connecting ring. The exhaust hole is realized by drilling a hole in the connecting ring.

[0019] Step 4: Make the inner cylinder and layer plates. The layer plates include multiple layers. After the head is formed, it is welded to the formed inner cylinder. Before welding, the inner cylinder is a long section of cylindrical cylinder. Before the layer plates are wrapped, they are cylinder sections without welded longitudinal seams. The cylinder sections are put on the welded head and inner cylinder, and then the layer plates are tightened into cylinder sections through wrapping tools. The longitudinal seams of the cylinder sections are welded, and the layer plates are wrapped layer by layer to form a multi-layer cylinder.

[0020] Step 5: The seams between the external head and the connecting ring, the seams between the external head and the internal head, the seams between the connecting pipe and the internal head, and the seams between the connecting pipe and the external head are welded respectively, and two groups of assemblies consisting of the external head, the connecting ring, the internal head and the connecting pipe are set.

[0021] Step 6: The inner cylinder is located between two groups of assemblies consisting of external heads, connecting rings, internal heads and connecting pipes. The two ends of the inner cylinder are welded to the corresponding internal heads respectively. The concentricity of the inner cylinder and the internal heads must be ensured, and the misalignment at the connection between the two is less than the corresponding regulations. The layers are wrapped layer by layer on the inner cylinder. The layers close to the inner cylinder are welded to the inner cylinder and the internal heads. The gap between the inner surface of the layer and the outer surface of the inner cylinder should be less than 3mm. The subsequent layers need to be wrapped layer by layer and welded with the internal heads, external heads, connecting rings and stepped steps at the corresponding positions. The misalignment at the connection is less than 1mm, and the gap between adjacent layers should be less than 3mm.

[0022] The high-pressure hydrogen storage container manufacturing method and structure provided by the present invention have good stress resistance, simple manufacturing, high safety, and excellent economy, which provides a guarantee for the safe storage of the hydrogen storage container in a high-pressure hydrogen environment and is conducive to large-volume storage of hydrogen under high pressure.

[0023] The above are only preferred embodiments of the present invention.

Claims

1. A method for manufacturing a high-pressure hydrogen storage container, characterized in that: The high-pressure hydrogen storage container includes an inner cylinder, a layer plate, a connecting ring, an external head, an internal head and a connecting pipe. The manufacturing process of the high-pressure hydrogen storage container is as follows: Step 1: Make the internal head. The top of the internal head is a spherical head, and the end straight edge is a cylindrical structure. A plate is heated and directly stamped. After stamping, the end is flanging and straightened to make a flat end of the head. After hot stamping, a hole is opened on the top of the internal head. The size of the hole matches the size of the pipe. A stepped step is processed on the end face of the end where the end straight edge of the internal head is located. Step 2: Make an external head. The top of the external head is a spherical head, and the end straight edge is a cylindrical structure. A plate is heated and directly stamped. After stamping, the end is flanging and straightened to make a flat end of the head. After hot stamping, a hole is opened on the top of the external head. The size of the hole matches the size of the pipe. A stepped step is processed on the end face of the end where the end straight edge of the external head is located. The external head is sleeved on the internal head, and the maximum gap between the inner surface of the external head and the outer surface of the internal head is less than 0-2mm. A leak detection hole with a hole size of φ4-φ8 is processed on the external head. Step 3: Make a connecting ring and connect it to the external head. The connecting ring is processed by forging, and the end step and the arc shape of the external head are processed. After processing and forming, the connecting ring is set on the outer surface of the external head. The maximum gap between the inner surface of the connecting ring and the outer surface of the external head is less than 0-2mm. The end face of the larger opening of the connecting ring is processed with a stepped step. The stepped steps on the internal head, external head and connecting ring are continuous. Step 4: Make the inner cylinder and the layer plate. The layer plate includes multiple, Step 5: The seams between the external head and the connecting ring, the seams between the external head and the internal head, the seams between the connecting pipe and the internal head, and the seams between the connecting pipe and the external head are welded, and two assemblies consisting of the external head, the connecting ring, the internal head and the connecting pipe are set. Step 6: The inner cylinder is located between two groups of assemblies consisting of external heads, connecting rings, internal heads and connecting pipes. The two ends of the inner cylinder are welded to the corresponding internal heads respectively. The concentricity of the inner cylinder and the internal heads must be ensured, and the misalignment at the connection between the two is less than the corresponding regulations. The layers are wrapped layer by layer on the inner cylinder. The layers close to the inner cylinder are welded to the inner cylinder and the internal heads. The gap between the inner surface of the layer and the outer surface of the inner cylinder should be less than 3mm. The subsequent layers need to be wrapped layer by layer and welded with the internal heads, external heads, connecting rings and stepped steps at the corresponding positions. The misalignment at the connection is less than 1mm, and the gap between adjacent layers should be less than 3mm.

2. The method for manufacturing a high-pressure hydrogen storage container according to claim 1, characterized in that: An exhaust hole with an opening size of φ4 to φ8 is processed on the connecting ring.

3. A high-pressure hydrogen storage container structure manufactured by the method for manufacturing a high-pressure hydrogen storage container according to claim 1 or 2, characterized in that: The invention comprises an inner cylinder (1), both ends of the inner cylinder (1) are fixedly connected with an internal head (5), an external head (4) is sleeved and fixed on the internal head (5), a connecting ring (3) is sleeved and fixed on the external head (4), both ends of the internal head (5) and the external head (4) are provided with openings, a pipe (6) is fixed in the opening, a leak detection hole is provided on the external head (4), and a multi-layer plate (2) is sleeved on the inner cylinder (1), and the plate (2) is fixed to the internal head (5), the external head (4) and the connecting ring (3) at corresponding positions.

4. A high-pressure hydrogen storage container structure according to claim 3, characterized in that: The connecting ring (3) is provided with an exhaust hole.

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