Sealing structure for connection of high-pressure hydrogen-contacting equipment and connecting pipe

Abstract

A reinforcing tube, a connecting tube gland and a locking ring are arranged between the connecting tube and the hydrogen-contacting equipment, during manufacturing, due to the fact that the inner diameter of the reinforcing tube is large, a ray source for nondestructive testing can be placed into the equipment, RT nondestructive testing can be carried out on equipment welding seams, the quality of the welding seams is guaranteed, and the sealing structure is simple in structure and convenient to operate. And the safe use of the equipment is ensured. The inner diameter of the reinforcing pipe is large, so that the internal corrosion condition of the equipment can be detected in the use process of the equipment; the later maintenance cost is low; and the connecting pipe gland and the locking ring are both detachable, the disassembly is simple, the manufacturing is convenient, the manufacturing difficulty is reduced, the cost is saved, and the equipment quality is also ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of high-pressure hydrogen storage container sealing structure in the hydrogen energy industry, and in particular, designs a sealing structure for the connection between high-pressure hydrogen storage equipment and the pipeline. Background Technology

[0002] The high-pressure hydrogen-sealing structure in a high-pressure hydrogen storage container is designed to ensure the sealing of high-pressure hydrogen gas, which is prone to leakage and explosion. Therefore, the rationality of the high-pressure hydrogen-sealing structure directly affects the leakage of hydrogen gas in the high-pressure hydrogen storage container and ultimately affects the safe use of the high-pressure hydrogen storage container.

[0003] In existing high-pressure hydrogen storage sealing technology, the inner diameter of the connecting pipe used to connect the high-pressure hydrogen storage container to other equipment is relatively small. This makes it impossible to perform effective non-destructive testing during equipment manufacturing, and it also makes it impossible to detect internal corrosion during subsequent maintenance. However, the inner diameter of the connecting pipe cannot be changed because it would cause a mismatch with the pipeline. Moreover, the seal between the connecting pipe and the hydrogen storage container is a metal-to-metal hard seal. If the sealing surface on the connecting pipe side is damaged, it can be replaced. However, if the sealing surface on the hydrogen storage container side is damaged, it is difficult to repair or replace, resulting in high maintenance costs. Therefore, there is still room for optimization and improvement in the existing high-pressure hydrogen storage sealing structure. Utility Model Content

[0004] (1) Technical problem to be solved: In view of the shortcomings of the existing high-pressure hydrogen storage hydrogen-sealing structure, such as the inability to perform effective non-destructive testing during equipment manufacturing, the inability to detect internal corrosion during subsequent use and maintenance, and the difficulty in repairing or replacing the damaged sealing surface of the hydrogen storage container, resulting in high maintenance costs, this utility model provides a sealing structure for the connection between the high-pressure hydrogen storage equipment and the pipeline that can overcome the above-mentioned shortcomings.

[0005] (2) The technical solution adopted by this utility model is as follows:

[0006] A sealing structure for connecting a high-pressure hydrogen supply device to a connecting pipe includes a reinforcing tube fixed to the housing of the high-pressure hydrogen supply device. A connecting pipe gland and a locking ring are disposed inside the reinforcing tube. The end of the connecting pipe gland adjacent to the locking ring is in contact. The reinforcing tube and the locking ring are connected by threads. A through hole is provided in the middle of the locking ring. A medium inlet / outlet hole is provided in the middle of the connecting pipe gland, communicating with the reinforcing tube. An extension is provided at the end of the connecting pipe gland, penetrating the through hole of the locking ring. A connecting hole one is provided in the middle of the end of the extension penetrating the locking ring. The diameter of the connecting hole one is larger than the diameter of the gas hole. A top ring is disposed inside the connecting hole one. A connecting hole two is provided in the middle of the top ring. A connecting pipe is connected to the connecting hole two by threads. A sealing sleeve is fitted on the connecting pipe. The sealing sleeve is threadedly connected to the connecting hole one. The end of the top ring adjacent to the sealing sleeve is in contact, and the other end of the top ring is in contact with the end wall of the connecting hole one. The connecting pipe communicates with the medium inlet / outlet hole. An O-ring is provided between the contact surfaces of the reinforcing tube and the connecting pipe gland.

[0007] A further technical solution is that the reinforcing tube has three enlarged holes arranged in sequence along the direction away from the shell. The shape and size of the end of the pipe gland close to the shell are matched with the enlarged holes one and two. The other end of the pipe gland is located in the enlarged hole three. The shape and size of the locking ring close to the end of the enlarged hole two are matched with the enlarged hole three.

[0008] A further technical solution involves having two O-rings.

[0009] A further technical solution is that the diameter of the medium inlet / outlet hole is equal to the inner diameter of the high-pressure pipe.

[0010] (3) Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0011] 1. This utility model's sealing device has a simple structure. A reinforcing tube, a tube cap, and a locking ring are installed between the connecting pipe and the hydrogen-containing equipment. During manufacturing, due to the large inner diameter of the reinforcing tube, a non-destructive testing (NDT) X-ray source can be placed inside the equipment to perform RT NDT on the welds, ensuring weld quality and thus guaranteeing the safe use of the equipment. The large inner diameter of the reinforcing tube also allows for the detection of internal corrosion during equipment use; subsequent maintenance costs are lower; reliability is higher; and both the tube cap and locking ring are detachable, simplifying disassembly and manufacturing, reducing manufacturing difficulty, saving costs, and ensuring equipment quality.

[0012] 2. The threaded locking rings at the ends of the reinforcing pipe and the pipe gland in the high-pressure hydrogen sealing structure of this utility model adopt a threaded connection structure, which makes it detachable and ensures uniform and reliable stress distribution. This utility model has better connection reliability and better high-pressure resistance.

[0013] 3. Building upon the advantages mentioned above, the hydrogen-resistant O-ring seal in this high-pressure hydrogen-sealing structure provides a replaceable sealing structure, with the reinforcing pipe and the connecting pipe gland sealed using hydrogen-resistant O-rings. This means that after the high-pressure hydrogen-sealing structure is manufactured, the sealing surface of the reinforcing pipe (i.e., the sealing surface on the hydrogen storage device side) is less prone to damage, and any damage to the sealing surface of the connecting pipe gland can be directly replaced or repaired, improving equipment manufacturing and maintenance efficiency. It also protects the sealing surface of the equipment body, making the sealing effect more reliable and reducing maintenance costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 for Figure 1 Enlarged schematic diagram of point I in the middle.

[0016] Figure 3 for Figure 1 Enlarged schematic diagram of section II. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-3 As shown. A sealing structure for the connection between a high-pressure hydrogen supply device and a connecting pipe includes a reinforcing tube 1 fixed to the housing 8 of the high-pressure hydrogen supply device. A connecting pipe gland 3 and a locking ring 2 are disposed inside the reinforcing tube 1. The end of the connecting pipe gland 3 adjacent to the locking ring 2 is in contact. The reinforcing tube 1 and the locking ring 2 are connected by threads. A through hole 9 is provided in the middle of the locking ring 2. A medium inlet / outlet hole 10 is provided in the middle of the connecting pipe gland 3, which connects to the reinforcing tube 1. An extension 16 is provided at the end of the connecting pipe gland 3, and the extension 16 penetrates the through hole of the locking ring 2. 9. The extension 16 passes through the middle of one end of the locking ring 2 and has a connecting hole 11. The diameter of the connecting hole 11 is larger than the diameter of the medium inlet / outlet hole 10. A top ring 6 is provided inside the connecting hole 11, and a connecting hole 12 is provided in the middle of the top ring 6. A connecting pipe 7 is connected to the connecting hole 12 by a thread. A sealing sleeve 5 is fitted on the connecting pipe 7. The sealing sleeve 5 is threadedly connected to the connecting hole 11. The top ring 6 is in contact with the end adjacent to the sealing sleeve 5, and the other end of the top ring 6 is in contact with the end wall of the connecting hole 11. The connecting pipe 7 communicates with the vent 10. The diameter of the vent 10 is equal to the inner diameter of the high-pressure connecting pipe 7.

[0019] The reinforcing tube 1 is directly welded to the high-pressure hydrogen storage equipment (high-pressure hydrogen storage tank). For example, during production, due to the large diameter of the reinforcing tube 1, a non-destructive testing (NDT) X-ray source can be placed inside the equipment to perform RT NDT on the weld seams. During use, since the connecting pipe 7, sealing sleeve 5, top ring 6, connecting pipe cap 3, and locking ring 2 are all connected, it is necessary to remove the locking ring 2 and connecting pipe cap 3 sequentially to inspect for internal corrosion. An O-ring 4 is installed between the contact surfaces of the reinforcing tube 1 and the connecting pipe cap 3. The inner and outer diameters of the O-ring 4 match the dimensions of the reinforcing tube 1 and the connecting pipe cap 3, ensuring that the O-ring 4 can be smoothly installed at the sealing position between the connecting pipe cap 3 and the reinforcing tube 1. The O-ring 4 prevents damage to the sealing surface inside the reinforcing tube 1. Traditionally, a sealing ring is not used because the diameter of the connecting pipe 7 is too small to be suitable for a sealing ring, and there is a lack of O-rings that have undergone hydrogen resistance testing. Therefore, this invention utilizes the transition between the reinforcing tube 1 and the connecting pipe cap 3. The reinforcing tube 1 is threadedly connected to the threaded locking ring 2. To ensure that the connector gland 3 can be smoothly installed on the reinforcing tube 1 and locking ring 2, the outer diameter of the connector gland 3 should be smaller than the inner diameter of the reinforcing tube 1, and the fitting clearance between the reinforcing tube 1 and the connector gland 3, and between the locking ring 2 and the connector gland 3, should be maintained. The reinforcing tube 1, locking ring 2, and connector gland 3 should be concentrically positioned. The sealing sleeve 5 is threadedly connected to the connector gland 3. To ensure that the high-pressure connector 7 and top ring 6 can be smoothly connected to the connector gland 3 and sealing sleeve 5, the outer diameter of the top ring 6 should be smaller than the diameter of the connecting hole 11 of the connector gland 3, and the outer diameter of the high-pressure connector 7 should be smaller than the inner diameter of the sealing sleeve 5. The top ring 6, high-pressure connector 7, and connector gland 3 should be concentrically positioned.

[0020] Inside the reinforcing tube 1, along the direction away from the housing 8, there are successively enlarged holes 13, 14 and 15. The shape and size of the end of the pipe gland 3 near the housing 8 are matched with the enlarged holes 13 and 14. The other end of the pipe gland 3 is located inside the enlarged hole 15. The shape and size of the end of the locking ring 2 near the enlarged hole 2 are matched with the enlarged hole 15.

[0021] The assembly process can be referenced below:

[0022] (1) Weld the reinforcing tube 1 to the shell 8, and insert the pipe gland 3 with O-ring seal 4 into the reinforcing tube 1. Preferably, two O-ring seals 4 are provided. One O-ring seal 4 is provided on the surface of the pipe gland 3 that contacts the inner wall of the expansion hole 13, and the other O-ring seal 4 is provided on the contact surface of the pipe gland 3 with the step between the expansion hole 13 and the expansion hole 2 14. A positioning groove is provided on the pipe gland 3 at the position where the O-ring seal 4 is provided. The O-ring seal 4 is located in the positioning groove, which is convenient for installation.

[0023] (2) After the pipe gland 3 is installed, screw the locking ring 2 into the expansion hole 3 15 of the reinforcing tube 1 and tighten the pipe gland 3. The locking ring 2 is threadedly connected to the reinforcing tube 1. The coaxiality should be ensured, and the thread accuracy should be controlled.

[0024] (3) Place the sealing sleeve 5 on the pipe 7, put the top ring 6 into the connection hole 11, screw the pipe 7 into the connection hole 22, and then connect the sealing sleeve 5 to the pipe gland 3 by thread. The coaxiality should be ensured, and the thread accuracy should be controlled.

[0025] The above-mentioned connecting pipes can be made of steel pipes, while the reinforcing pipe, threaded locking ring, connecting pipe gland, sealing sleeve, and top ring can be made of forgings. During the assembly process, the concentricity of the reinforcing pipe, locking ring, and connecting pipe gland must be ensured. The O-ring is made of hydrogen-resistant rubber to ensure good hydrogen compatibility and stable performance.

[0026] The above are merely preferred embodiments of this utility model.

Claims

1. A sealing structure for connecting a high-pressure hydrogen supply device to a connecting pipe, characterized in that, The device includes a reinforcing tube (1) fixed to the housing (8) of a high-pressure hydrogen supply equipment. Inside the reinforcing tube (1) are a connecting pipe cap (3) and a locking ring (2). The connecting pipe cap (3) and the locking ring (2) are in contact at adjacent ends. The reinforcing tube (1) and the locking ring (2) are connected by threads. A through hole is provided in the middle of the locking ring (2). A medium inlet / outlet hole is provided in the middle of the connecting pipe cap (3), which connects to the reinforcing tube (1). An extension is provided at the end of the connecting pipe cap (3), penetrating the through hole of the locking ring (2) and extending through one end of the locking ring (2). The part is provided with a first connection hole, the diameter of which is larger than the diameter of the medium inlet and outlet hole. A top ring (6) is provided inside the first connection hole, and a second connection hole is provided in the middle of the top ring (6). A connecting pipe (7) is connected to the second connection hole by a thread. A sealing sleeve (5) is fitted on the connecting pipe (7). The sealing sleeve (5) is threadedly connected to the first connection hole. The top ring (6) is in contact with the end of the sealing sleeve (5) adjacent to it. The other end of the top ring (6) is in contact with the end wall of the first connection hole. The connecting pipe (7) is connected to the medium inlet and outlet hole. An O-ring (4) is provided between the contact surface of the reinforcing pipe (1) and the connecting pipe cap (3).

2. The sealing structure for connecting a high-pressure hydrogen supply device and a connecting pipe according to claim 1, characterized in that, The reinforcing tube (1) has three enlarged holes arranged in sequence along the direction away from the shell (8). The shape and size of the end of the pipe gland (3) near the shell (8) match the enlarged holes one and two. The other end of the pipe gland (3) is located in the enlarged hole three. The shape and size of the end of the locking ring (2) near the enlarged hole two match the enlarged hole three.

3. The sealing structure for connecting a high-pressure hydrogen supply device and a pipe according to claim 2, characterized in that: The O-ring (4) consists of two.

4. The sealing structure for connecting a high-pressure hydrogen supply device and a pipe according to claim 1, characterized in that: The diameter of the medium inlet / outlet hole is equal to the inner diameter of the connector (7).

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